class MyCommand extends \Symfony\Component\Console\Command\Command
{
    use Invokable;

    // $username/$roles are the argument/option defined below
    public function __invoke(IO $io, string $username, array $roles)
    {
        $io->success('created.');

        // even if you don't inject IO, it's available as a method:
        $this->io(); // IO
    }

    public function configure(): void
    {
        $this
            ->addArgument('username', InputArgument::REQUIRED)
            ->addOption('roles', mode: InputOption::VALUE_IS_ARRAY)
        ;
    }
}