diff --git a/Userland/Libraries/LibCore/Account.cpp b/Userland/Libraries/LibCore/Account.cpp
index e2ab5eba2e6..9109343643b 100644
--- a/Userland/Libraries/LibCore/Account.cpp
+++ b/Userland/Libraries/LibCore/Account.cpp
@@ -98,9 +98,9 @@ ErrorOr<Account> Account::self([[maybe_unused]] Read options)
     return Account(*pwd, spwd, extra_gids);
 }
 
-ErrorOr<Account> Account::from_name(char const* username, [[maybe_unused]] Read options)
+ErrorOr<Account> Account::from_name(StringView username, [[maybe_unused]] Read options)
 {
-    auto pwd = TRY(Core::System::getpwnam({ username, strlen(username) }));
+    auto pwd = TRY(Core::System::getpwnam(username));
     if (!pwd.has_value())
         return Error::from_string_literal("No such user");
 
diff --git a/Userland/Libraries/LibCore/Account.h b/Userland/Libraries/LibCore/Account.h
index e75de6f71a1..f34a698ba03 100644
--- a/Userland/Libraries/LibCore/Account.h
+++ b/Userland/Libraries/LibCore/Account.h
@@ -32,11 +32,9 @@ public:
         PasswdOnly
     };
 
-    // FIXME: Convert the methods below to take StringViews instead.
-
     static String parse_path_with_uid(StringView general_path, Optional<uid_t> force_uid = {});
     static ErrorOr<Account> self(Read options = Read::All);
-    static ErrorOr<Account> from_name(char const* username, Read options = Read::All);
+    static ErrorOr<Account> from_name(StringView username, Read options = Read::All);
     static ErrorOr<Account> from_uid(uid_t uid, Read options = Read::All);
 
     bool authenticate(SecretString const& password) const;
@@ -51,11 +49,11 @@ public:
     // You must call sync to apply changes.
     void set_password(SecretString const& password);
     void set_password_enabled(bool enabled);
-    void set_home_directory(char const* home_directory) { m_home_directory = home_directory; }
+    void set_home_directory(StringView home_directory) { m_home_directory = home_directory; }
     void set_uid(uid_t uid) { m_uid = uid; }
     void set_gid(gid_t gid) { m_gid = gid; }
-    void set_shell(char const* shell) { m_shell = shell; }
-    void set_gecos(char const* gecos) { m_gecos = gecos; }
+    void set_shell(StringView shell) { m_shell = shell; }
+    void set_gecos(StringView gecos) { m_gecos = gecos; }
     void delete_password();
 
     // A null password means that this account was missing from /etc/shadow.
diff --git a/Userland/Services/LoginServer/main.cpp b/Userland/Services/LoginServer/main.cpp
index 34fc819e2f4..0efd279042a 100644
--- a/Userland/Services/LoginServer/main.cpp
+++ b/Userland/Services/LoginServer/main.cpp
@@ -80,7 +80,7 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
 
         auto fail_message = "Can't log in: invalid username or password."sv;
 
-        auto account = Core::Account::from_name(username.characters());
+        auto account = Core::Account::from_name(username);
         if (account.is_error()) {
             window->set_fail_message(fail_message);
             dbgln("failed graphical login for user {}: {}", username, account.error());
@@ -99,13 +99,13 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
         login(account.value(), *window);
     };
 
-    char const* auto_login = nullptr;
+    StringView auto_login;
 
     Core::ArgsParser args_parser;
     args_parser.add_option(auto_login, "automatically log in with no prompt", "auto-login", 'a', "username");
     args_parser.parse(arguments);
 
-    if (!auto_login) {
+    if (auto_login.is_empty()) {
         window->show();
     } else {
         auto account = Core::Account::from_name(auto_login);
diff --git a/Userland/Services/SystemServer/Service.cpp b/Userland/Services/SystemServer/Service.cpp
index c8a4da259b1..673f0683c52 100644
--- a/Userland/Services/SystemServer/Service.cpp
+++ b/Userland/Services/SystemServer/Service.cpp
@@ -299,7 +299,7 @@ Service::Service(Core::ConfigFile const& config, StringView name)
 
     m_user = config.read_entry(name, "User");
     if (!m_user.is_null()) {
-        auto result = Core::Account::from_name(m_user.characters(), Core::Account::Read::PasswdOnly);
+        auto result = Core::Account::from_name(m_user, Core::Account::Read::PasswdOnly);
         if (result.is_error())
             warnln("Failed to resolve user {}: {}", m_user, result.error());
         else
diff --git a/Userland/Utilities/groups.cpp b/Userland/Utilities/groups.cpp
index 09eddadac01..8bd261b58ea 100644
--- a/Userland/Utilities/groups.cpp
+++ b/Userland/Utilities/groups.cpp
@@ -47,8 +47,8 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
         print_account_gids(account);
     }
 
-    for (auto username : usernames) {
-        auto result = Core::Account::from_name(username.characters(), Core::Account::Read::PasswdOnly);
+    for (auto const& username : usernames) {
+        auto result = Core::Account::from_name(username, Core::Account::Read::PasswdOnly);
         if (result.is_error()) {
             warnln("{} '{}'", result.error(), username);
             continue;
diff --git a/Userland/Utilities/id.cpp b/Userland/Utilities/id.cpp
index b5044bb6ae2..5b0f662a759 100644
--- a/Userland/Utilities/id.cpp
+++ b/Userland/Utilities/id.cpp
@@ -53,7 +53,7 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
         if (auto user_id = user_str.to_uint(); user_id.has_value())
             account = TRY(Core::Account::from_uid(user_id.value(), Core::Account::Read::PasswdOnly));
         else
-            account = TRY(Core::Account::from_name(user_str.characters(), Core::Account::Read::PasswdOnly));
+            account = TRY(Core::Account::from_name(user_str, Core::Account::Read::PasswdOnly));
     } else {
         account = TRY(Core::Account::self(Core::Account::Read::PasswdOnly));
     }
diff --git a/Userland/Utilities/passwd.cpp b/Userland/Utilities/passwd.cpp
index e1d8585e785..b8300a4b5e3 100644
--- a/Userland/Utilities/passwd.cpp
+++ b/Userland/Utilities/passwd.cpp
@@ -46,7 +46,7 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
 
     // target_account is the account we are changing the password of.
     auto target_account = TRY(!username.is_empty()
-            ? Core::Account::from_name(username.characters())
+            ? Core::Account::from_name(username)
             : Core::Account::from_uid(current_uid));
 
     setpwent();
diff --git a/Userland/Utilities/su.cpp b/Userland/Utilities/su.cpp
index 52b07df2149..b39a415fec9 100644
--- a/Userland/Utilities/su.cpp
+++ b/Userland/Utilities/su.cpp
@@ -21,7 +21,7 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
     if (!TRY(Core::System::isatty(STDIN_FILENO)))
         return Error::from_string_literal("Standard input is not a terminal");
 
-    char const* user = nullptr;
+    StringView user;
 
     Core::ArgsParser args_parser;
     args_parser.add_positional_argument(user, "User to switch to (defaults to user with UID 0)", "user", Core::ArgsParser::Required::No);
@@ -30,7 +30,7 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
     if (geteuid() != 0)
         return Error::from_string_literal("Not running as root :(");
 
-    auto account = TRY(user ? Core::Account::from_name(user) : Core::Account::from_uid(0));
+    auto account = TRY(user.is_empty() ? Core::Account::from_uid(0) : Core::Account::from_name(user));
 
     TRY(Core::System::pledge("stdio tty exec id"));
 
@@ -51,7 +51,6 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
 
     TRY(Core::System::setenv("HOME"sv, account.home_directory(), true));
 
-    execl(account.shell().characters(), account.shell().characters(), nullptr);
-    perror("execl");
+    TRY(Core::System::exec(account.shell(), Array<StringView, 1> { account.shell().view() }, Core::System::SearchInPath::No));
     return 1;
 }
diff --git a/Userland/Utilities/userdel.cpp b/Userland/Utilities/userdel.cpp
index 381e38e2810..373bc4e27ef 100644
--- a/Userland/Utilities/userdel.cpp
+++ b/Userland/Utilities/userdel.cpp
@@ -33,7 +33,7 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
     TRY(Core::System::unveil("/etc/", "rwc"));
     TRY(Core::System::unveil("/bin/rm", "x"));
 
-    char const* username = nullptr;
+    StringView username;
     bool remove_home = false;
 
     Core::ArgsParser args_parser;
diff --git a/Userland/Utilities/usermod.cpp b/Userland/Utilities/usermod.cpp
index 5896ad91b8d..5dce973db0d 100644
--- a/Userland/Utilities/usermod.cpp
+++ b/Userland/Utilities/usermod.cpp
@@ -30,11 +30,11 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
     int gid = 0;
     bool lock = false;
     bool unlock = false;
-    char const* new_home_directory = nullptr;
+    StringView new_home_directory;
     bool move_home = false;
-    char const* shell = nullptr;
-    char const* gecos = nullptr;
-    char const* username = nullptr;
+    StringView shell;
+    StringView gecos;
+    StringView username;
 
     auto args_parser = Core::ArgsParser();
     args_parser.set_general_help("Modify a user account");
@@ -62,7 +62,7 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
 
     if (move_home) {
         TRY(Core::System::unveil(target_account.home_directory(), "c"sv));
-        TRY(Core::System::unveil({ new_home_directory, strlen(new_home_directory) }, "wc"sv));
+        TRY(Core::System::unveil(new_home_directory, "wc"sv));
     }
 
     unveil(nullptr, nullptr);
@@ -98,11 +98,11 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
         target_account.set_password_enabled(true);
     }
 
-    if (new_home_directory) {
+    if (!new_home_directory.is_empty()) {
         if (move_home) {
-            int rc = rename(target_account.home_directory().characters(), new_home_directory);
-            if (rc < 0) {
-                if (errno == EXDEV) {
+            auto maybe_error = Core::System::rename(target_account.home_directory(), new_home_directory);
+            if (maybe_error.is_error()) {
+                if (maybe_error.error().code() == EXDEV) {
                     auto result = Core::File::copy_file_or_directory(
                         new_home_directory, target_account.home_directory().characters(),
                         Core::File::RecursionMode::Allowed,
@@ -113,11 +113,11 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
                         warnln("usermod: could not move directory {} : {}", target_account.home_directory().characters(), static_cast<Error const&>(result.error()));
                         return 1;
                     }
-                    rc = unlink(target_account.home_directory().characters());
-                    if (rc < 0)
-                        warnln("usermod: unlink {} : {}", target_account.home_directory().characters(), strerror(errno));
+                    maybe_error = Core::System::unlink(target_account.home_directory());
+                    if (maybe_error.is_error())
+                        warnln("usermod: unlink {} : {}", target_account.home_directory(), maybe_error.error().code());
                 } else {
-                    warnln("usermod: could not move directory {} : {}", target_account.home_directory().characters(), strerror(errno));
+                    warnln("usermod: could not move directory {} : {}", target_account.home_directory(), maybe_error.error().code());
                 }
             }
         }
@@ -125,11 +125,11 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
         target_account.set_home_directory(new_home_directory);
     }
 
-    if (shell) {
+    if (!shell.is_empty()) {
         target_account.set_shell(shell);
     }
 
-    if (gecos) {
+    if (!gecos.is_empty()) {
         target_account.set_gecos(gecos);
     }