For guitar, you can send a sound card (expensive), a voice clip/strap (he will think of you every time he uses it, which is more practical and relatively cheap), guitar strings (such as elixir), guitar-related accessories (such as plucked necklaces, which cool boys may like), and a Deng Lupu guitar care set.

For street dance, we can consider the things that dancers usually use in their performances, such as hats, belts, retro sunglasses, HipHop brand underwear and so on. If you like hip hop and guitar, you must like music very much. You can also consider Bluetooth speakers and headphones.

If you don't know much about roller skating, you can consider sending protective gear and the like.

In fact, if you give a gift, the most important thing is to let him feel your heart. I hope I can help you ~