He's in Shugo Chara!. He's the antagonist who becomes a protagonist that works for Easter Corp. and enjoys teasing the main character. He is known for having blue cat ears that toon up whenever he combine with Yoru, his would-be self.
What do u mean? The toon isn't rude at all. It's very cute. If u mean Ikuto, he's kind of aloof and mysterious, and he tends to be perverted towards Amu a lot. But othe than thought, no, neither is rude.
