This is Ruben. He has a perpetually grump face and generally apathetic demeanour, unless his inner nerd raises its enthusiastic head. He studied Art with a capital A, and now he's figuring out ways to beat people up with his bike. Despite looking like a mellow fellow, he is actually capable of formidable violence.

Super-relaxed work in Clip Studio Paint.
Lensflare added in Photoshop because I could not resist.