I don't like Claude. He annoys me. He has irritating hair, his little plushie bunnie is hideous, plus his personality, and powers aren't all that great. His one redeeming feature is that Ririn calls him Crawd, which is funny sounding.
Nova is kind of stupid as well, but at least they actually admitted that they weren't really giving him a personality and made that BE his personality. His plushie form doesn't even have a mouth.