The beautifully packaged album, the passionate Elvis real-life cartoon doll, and the hand-painted sun jars of the twelve zodiac animals are good. They are very suitable for friends as birthday gifts. They are beautiful and meaningful, representing your blessings to him. I hope he will succeed in his studies and have a bright future. You are still a student, so don't buy gifts that you can't afford. Ordinary gifts are affordable and will not cause misunderstandings.
Your classmate likes sports, so you can also give him a fashionable sports watch. Since you call him a blue friend, it means that he helps you a lot and knows you very well. Then you can also give him his favorite shoes and shirts. If you are afraid of misunderstandings from others, you can give them to him secretly. As long as both of you know that you are in an ordinary relationship, then let others say whatever they want.
When I passed by a jewelry store yesterday, I saw a men's perfume with a very beautiful shape. You can also give him perfume. As for what kind of perfume it is, it depends on your economic level. Just buy something similar.