Mace's boisterous personality can make it hard for others to really think of him in a positive light. He is quick to resort to violence, has trouble staying quiet, and often thinks without speaking. Despite his thorny and self serving exterior, Mace hides a troubling past beneath many layers- he lost his parents and brother back on Earth due to a wild coyote attack. Mace describes his younger self as weak because of his inability to save his family, despite knowing deep down none of his actions would have changed fate. Even though Mace is not necessarily compassionate or kind, he would not wish what he went through on anyone else. He is protective of the not-cats in Shadow Moses, as Mace is afraid of losing anyone else, despite no one truly getting along with him (he also wants to prove to himself that he is different from his young, weaker self.). Friendships are foreign to him, but he wants to try to form a true bond with someone one day. In the end, Mace keeps himself an arms length from everybody else, but he wonders what a friendship feels like.