As MarioSilva mentioned, it's absolutely possible. Luckily for us, Nintendo actually left the player physics in the romfs due to each character having different values. This can be found in ObjectData, where each character has their own file. Mario.szs for Mario, Luigi for Luigi, Kinopio for Toad, Peach for Peach, and Rosetta for Rosalina. Inside each one you can find PlayerConst.byml, which you can edit with Switch Toolbox. Someone made a handy
video as well.
It´s not so easy to make these changes working properly on WiiU, dude.
This function of having faster moving characters was disabled in Mario 3D World for WiiU. For a good reason!
A lot of patching is required in order to get this function without bugs or stuttering.
And the question is: Would you program that? Can you even handle Assembler? No?
Without assembler you can forget it. Not gonna working.
The result would be the same as gettting stuttering 20-25 fps in GTA III (instead of 60 fps in Mario 3D World).
Currently it´s much better to go through this step-by-step.
I´m currently finding solutions on getting the OS of WiiU tremendously faster (10x speedup!)...
And that will take some time.
It´s quite easy if you understand how the system actually works to get this done (and i reckon this is exactly what they did when the WiiU-OS got faster in early WiiU-development)...
But if you don´t know how this system works, it´s hard.
But there might be a little risk of bricking...The question for me is: Is it worth it speeding up the OS-loading itself by 10x?
And i say. Yes it is. The system would not fully brick. But it could be it semi-bricks.
Which means i have to use recovery to get it working again.
Well. No risk, no fun, right?