Answer to the last riddle is: Lionblaze!

I was killed by the cold

I wasn't even that old

I was buried in the snow

My clan will never know,

That I was half clan

My eyes are a hue of cyan

Answer will be in the next chapter! This one is probably a bit weird cuz i tried to make it rhyme XD. Anyways RosestarofRoseClan11 and Sparrklight commented the answer to the last riddle correctly!