A yandere boy is someone who has a obsessive and jealous nature. He can be controlling and possessive of their love interest and wants to make sure no one else can have them. He wants his love interest all to himself, he can get very jealous if she even speaks or looks at anyone else. This can lead to some explosive and destructive moments where he becomes violent and even dangerous. He is very obsessive and controlling, and can sometimes even stalk his love interest.