Possible with Discord?

That you can give yourself certain roles to a member with, for example, a bot command. Or better yet, by responding to a message

For example, what do you play? And then you can choose between Ps4, Xbox and Pc and then get the appropriate role.

Yes, there are many servers. As long as you can program it, almost anything is possible.

Do you want to code the bot yourself? If so, which language and library?

If you're just looking for one, MEE6 should fit

I could recommend Zira too! All you need is English knowledge and then you will get it quickly. I have had great experience with it and can recommend it very well!