Here, have a picture of Kappa and Foxie as Sonic the Hedgehog characters. Why not?
They probably wouldn't be all that speedy: if they were playable characters, I imagine Kappa's skill set would mirror Knuckles' pretty closely, and Foxie would be like Amy Rose.
Of course, I haven't actually played any Sonic games myself--I've only watched others play them! But Knuckles is still my favorite :3
Neither Kappa nor Foxie typically wear shoes, so I just made them up some, since a vast majority of Sonic characters wear some type of footwear.
Link
Sleet the Fox
Cuteness! The one on the right somewhat reminds me of the design of the comic book character Nicole (a lynx).