Living in a dormitory is like being with family. It is not easy to get along with each other so well, so we should cherish and maintain such a fate. However, it is not considered graduation, so it is recommended to give a fun and creative birthday gift.
You can use a friend's photo to customize a CS-style real-life doll, which can be made into a team style of four people, and put it in the dormitory to make it cool. Of course, there are also DIY computer accessories, made into CS spray-painted, and given to him. A mouse and keyboard that suits his feel will greatly improve his shooting level.
When a friend invites you to dinner on his birthday, you can also give some special items for men, such as lighters, wallets, perfumes, men's necklaces, etc. There are many such gifts, which can be customized. I hope it helps, and I wish you all the best.