Stoatstar (It/its), having been born with three legs, always had to work much harder to prove its own worth to others. In time, it grew prickly and bitter. It formed TechClan partially out of spite and never quite formed a good relationship with the other leaders. When Elkstar took over, it was the first to be captured. This soured its relationship with the BeastClan leader further. Its clan resides in an abandoned twoleg factory. Stoatstar's ambitions and motives for use of the OLD_SPIRITS are to claim the rest of the forest and that beyond the territories, a plan which would endanger not only the clans themselves but the loners and kittypets over the fence as well.
Wolfstar is certainly an outlier, as his motives are unknown even to his closest clanmates, though rumors do get around. He has one of the more unique structures for his clan. He believes that as MagicClan's leader, he is the sole cat capable of mentoring. He takes three apprentices at a time, putting them through rigorous and often deadly challenges to test their absolute limits. Very few live to become graduate warriors, leaving MagicClan one of the smallest. While this would normally leave it very vulnerable, Wolfstar and, by extension, the clan, have a powerful connection with StarClan, granting the leader prophetic abilities typical of a medicine cat. This prophetic eye was excised by Elkstar in order to weaken and capture Wolfstar. The other three leaders are highly disapproving of Wolfstar's methods, particularly Stinkbugstar, whose clan consists primarily of former graduate apprentices.
In case you didn't notice, I've got a lot more on these guys than the other two lol. I'm barely even scratching the surface with these descriptions.