Swang is an encounter designed to be very simple, and to synergize well with Reggie as well. Swang's main mechanic will involve him charging around and attempt to slam into opponents, goring them with his large tusks.
Past that, he can punch very hard, to the degree that hitting someone twice could stun them.
Swang is hot headed, short tempered, and often sees red. He doesn't take well to insults, being bossed around by anyone but his actual boss, or people cutting him in line.
He is also a simple creature - he just wants to exist. So, he just does what he's told and goes about his business.
Swang is an angry fellow, who makes poor decisions. So, he's found that his best course of action is to be told what to do and what to think instead. He's floated from organization to organization, boss to boss, doing whatever they say until they fall out for one reason or another.
That is, until he found Clan Extremis. Sliver has proven to be the best boss he's ever had, and he can let loose his anger constantly in the Court of Carnage.
He's a simple creature, that has simple needs.