First of all, I hope you are doing fine in your PLKN.
As long as I have played Taiko, i have hoped that someone could replace the Don-character with something cooler. How about color and size changing bars / patterns which could move to the beat of the music. So, this is a timid request / suggestion for you. Making something that replaces the Pippi-don character and look fitting to the game screen would really be important, because my EVERY friend that i have showed Taiko! to, have asked me wtf is that thing in the upper left corner. I really hope you consider my request, guys!
I have seen something like beating heart-pattern and a dancing miku character, which really freshen the look of osu's taiko.
My ideas of the replacing pattern so far
A speaker
Osu! logo that moves to the beat (like a mini version of the main menu logo)
Bouncing bars
I know it could be hard but i trust that you can invent something amazing.