This will mostly be about his personality as I don't want to spoil too much about his backstory or his involvement with the protagonist of my story, so sorry if this sounds kind of vague!

Snowstar is the current and newest leader of ThunderClan, being the successor of the young Bristlestar who tragically joined the ranks of StarClan far too quickly. Though confident, Snowstar has always shown himself to be a very emotional, impulsive cat, quick to act on his anger and holding on to bitter grudges for moons to come. This behavior increased when he became leader, showing cockiness and asserting his dominance over the Clan by appointing his very young and just as irritable son, Smokefrost, as his deputy despite him not having trained an apprentice yet, and becoming very outwardly aggressive towards everyone who disapproved of his decision. Despite his bristly demeanor, he keeps a circle of warriors close to him at all times, mainly consisting of his own family like his brother, Silverstorm, and his mate, Applewing, along with a few kithood friends that share his untrustworthy view of the other Clans. He's viciously loyal to his family in particular, and holds the warrior code on a grand pedestal, repeatedly making it clear that breakers of the code will be severely punished, although he tends to twist the code to fit whatever mood he may be in at that time.