I was really looking forward to getting Oxide and all, so they should put him in there.
These are my suggestions countering the Tick's recommended 3 racers:
Tawna- This can't be done- after the first generation she ran away with Pinstripe and left a note on Crash's bed saying so. The only exception would be if she raced
with Pinstripe, against you. Or you could unlock her as a hidden racer on team evil.
Koala Kong- This was also impossible- after generation one, he disappeared and went to some island to retire and eat eucalyptus leaves until gen. 5- then after that we never saw him again. CTR was gen.4, by the way.
N.Brio- Could have been done- but if we look over to Cb2, he was rivaling Cortex, and only in CB did he re-unite. So, he would probably be on a neutral side- perhaps hidden only, and has a mask glitch like Penta.
If you see me posting, it's because I've been asked to. Which I guess would mean I'm taking requests.