KD's original reasoning for that is because Klonoa looks like a Sonic character (though, now he attributes it to Felix the Cat and other unclothed cartoon characters), and that he believes that furry characters like Klonoa shouldn't have to wear clothes all the time because of their own fur and sheathings.
No underwear either. Just Klonoa's own fur. KD's original reasoning for that is because Klonoa look
Again, as I've said, it's an AU of Klonoa. An alternate universe. Of course it isn't canon. Every fan-made thing you see on the Net isn't canon.
In your words, then, people shouldn't be swapping Asriel's and Sans' roles with each other in the Undertale Storyshift AU. Or shipping Sora and Roxas from Kingdom Hearts. Or turning Rainbow Dash into a super-powered albino pegasus (also KD's thing) instead of using Rainbow Power. "Because it isn't canon."
Let these fans do what they wish to. It's no fun and there'd be an extreme lack of creativity if people stuck to canon all the time.
Eh, besides, there's absolutely no indication that Klonoa wears undies in canon anyway, and even if there was, I doubt KD would care anyway.
Again, as I've said, it's an AU of Klonoa. An alternate universe. Of course it isn't canon. Every fa