Custom Murder Drones Characters for MKPC tutorials ig

so uhhhhh.. i've created two of my custom circuits related to Murder Drones and Mario's Madness. i was a little satisfied but what i'm missing.. is that how do i make custom playable Murder Drones Characters. i mean i created a Custom Character Named "Super Horror Mario". i tried many ways on how to reduce Size since they told me on a online race that my character had a big mushroom. but that's not what i'm talking about right now.. i slightly don't do Pixel Art or Pixel Sprites (i mostly use my phone and a pixel art app to create those custom sprites) but i need help on Making Custom Playable Murder Drones Characters for MKPC.

i guess i can help if i watch the series