Turns out open-source moddable kart games with strong communities are pretty easy to add custom characters to...
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(While it's mostly getting around through memey suffering videos like https://www.youtube.com/watch?v=E-jTRZ5zcFU [CW for using very brief clips of angry gamers in places, maybe], SRB2Kart is legitimately pretty dang fun.
No I'm not doing MD3 models. I kinda prefer the spritery.
Probably.)
Also the soundtrack for the base non-kart game is amazing: https://www.youtube.com/watch?v=BGfIGuc9viA&list=PL4DtJjM6uuWIzUReALp6_J-LEwPSS84Xy&index=1