Yep, the clock owl experiment is chibi, but I don't think it looks that different from the common, just upside down lol. And then I'd forgotten about Jowday since she has a custom overlay and doesn't look like the experiment anymore!

...I have to admit that Urubu is pretty cute.

That's a good point about the Chibi pets. I think it's because different pets have different artists. I feel like the Scribble pets are inconsistent too, with some looking more like basic drawings than silly cartoonish and rushed pictures that were, well, scribbled. But again, that might be down to them having different artists. I just think the newer Scribble pets don't look as silly and scribbly as the older ones.

Something else that came to mind about pets and colours is the Reborn Blob. It's meant to look like a flame, but it has blue eyes that look out of place. You could argue that fire can be blue, but I still think it would look better with red or yellow eyes. I guess that could be possible with a custom overlay, but it would be strange if that was the only part of the image that was changed, at least it would be to me.

Endeavor is basically recoloured Blue-eyes White Dragon

I lost sleep over this when I was a kid. Felt so betrayed.

As a battler it irks me when the Ice King challenges me to a duel and I accidentally leave the page and lose the link to the fight. I don't know how else to get to the guy, because there's no link to him in the Coliseum.