Newtstar

Newtswirl, previously Atticus, was a kittypet during his younger years. He lived a relaxed life with his two-legs, the only disruption being the rare bullying and teasing from other kittypets in his neighborhood. Atticus decides eventually to leave after hearing stories of wild cats that lived in the forest near his neighborhood. 

He is temporarily invited into a, now disbanded, clan. He learns their culture, rank system, and how they survive in the forest. The clan disbands after a severe issue with their hierarchy. 

He decides, after a while of living on his own, to form his own clan. He settles in a semi-swampy area and gradually builds up the member count of the clan. 

He never removed his collar, as he takes pride in his past, showing how far he progressed.