Krad did seem a little more psychotic in the anime than he did in the manga, but that may be because he barely has any depth to him at all in the anime. He came across as just some random psycho who wanted to kill Dark because... uh, they needed a villain? First appearance-wise: In the anime, Satoshi flailed around a little bit and then Krad appeared, had a rather clichéd hero/villain exchange with Dark, and then just started blowing crap up before disappearing. In the manga, he appeared much more mysterious, and we actually saw his more reserved side before he went all CHOKECHOKE on Daisuke. The anime barely even touched on how he interacts with Satoshi. They could have done better with that. :<
Edit: Oh! And how come in the anime, Dark is always wearing the same thing as Daisuke, but Krad's outfit is always that weird thing with the really tight leggings?
And yes, Krad fans are always welcome! He is a very interesting character. :3 And he could use more fans.