This is something Chris will probably not win. I don't think he could articulate it to someone as it being a parody-- since he is very passionate that it's his own 'original' electric hedgehog pokemon. I think he would consider the parody option as something that would be insulting to his creative genius.
I think it would be a cold day in Hell before Chris even considers changing Sonichu into like-- I dunno, a yellow cat with electric magic named "Sonchu" with other multicolored cats. Probably would make his life easier though
Im surprised he got away with this as long as he did. How many books did he sell before being busted?