Full name: Leim Axkoth.
He is a male of the alien species that Lemn is, and shares similar traits that she does. Only he is currently more "feral" than her.
He was brought to Earth (or whatever planet Lemn resides on) not only for the exact reasons that Lemn was, but to be a potential mate for her. Safe to say, it didn't take long for the mate part to happen at least.
Lemn doesn't allow anyone to "domesticate" him into society, but rather do it herself, her own way of course.