One more minor thing:
1. I finally found a glitch! In Color Blocks Meadow, I was standing under a question mark block that had multiple coins in it, and I kept repeatedly hitting it... but Mario was constantly moving to the side and I was eventually ejected by the corner!
2. Found second glitch. The character Rihunu Tempest or whatever her name is from Reincarnated as a Slime cannot enter portraits. I just spent 190 coins on this, amazing.
Logical choice would be to have all characters at the same height as Mario, and using a similar/the same hitbox.