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 onyesha up whenever he combine with Yoru, his would-be self.
What do wewe mean? The onyesha isn't rude at all. It's very cute. If wewe 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.