how do i unlock characters

i got first in the mkds mushroom cup but i didnt unlock anyone

To unlock the half of MKPC's characters, I advise to get all trophy on GP on official MKPC track.

You can unlock the other MKPC's characters In custom track GP create by players.*
1 characters unlock = 1 gold trophy (or plus)
4 bronzes trophy = 2 silvers trophy = 1 gold trophy
2 bronzes trophy = 1 silver trophy

You can even unlock custom character when you complete a challenge where if you success, you have a custom character.

I use custom characters 👌

I use custom characters 👌