Hamato "Splinter" Yoshi. In my AU/crossover universe, Splinter is a kirin and got adopted into a family of ponies and became siblings with Oraku Saki (Shredder) as a young Kirin. Oraku and Hamato were very close brothers and trained together, but the rivarly started when they meet a young mare named Shen and things went downhill from there.

(More of the backstory will be told later on when I can come up with something, and I have ideas but I don't feel like writing them down right now. Every character of mine has a backstory, I just need to write it)