lmao i didnt know Toad Stool was your brother XD i asked him how he did some css edits on twitter not too long ago but he just replied with
"param/ui/ui_character_db.bin And param/eshop/dlc_param_c.bin I recommend also having a ui_character_db.bin from 1.0.0 as this contains the Character names that aren't listed in the updates."
and im yet to hear back from him again rip
He tends to do that...a lot. He's forgetful at times.