Giving this a re-evaluation, I'm still about the same with it as I was the first time. I do have a few nagging issues to note.
It's not uncommon for a character to use custom buttons, but I find it so odd that Custom 1 is used for a slightly niche option of an alternative stopping method for taznado, yet a dive move that can slide under short obstacles or give an emergency burst of speed, is put on Custom 2, a considerably lower priority button. I feel like these could have been swapped, or modular via console command, as I found myself wanting to use the dive a lot more than the taznado emergency stop, but I'd have to reconfigure my gamepad to do so.
I also have issue with an aspect of the bubble gum. Unless I'm missing something, I don't see any visual indicator when you actually have it, making it easy to lose track if you DO have it or not. this isn't a problem the burp has, since that has particles spawn. I feel something similar could be done with the gum, or perhaps a HUD element. I do appreciate that Taz has such a potentially crazy shield-like powerup all to himself though. It's been fun to jump and float for so long without landing!
Taz isn't really my kind of playstyle, but I do appreciate you making Taz feel like this spinning top death machine like he usually is. Especially with Taz mode really letting you rip up everything sprite-based in sight. While he can be fun at times, he's probably not something I'd return to much, as I feel like I tapped out on what I'll get out of him already. I do chalk this up as another character that's proof you don't need to create your own whole sprite sheet to make a unique character.