Lupis Rex/Personality and Relationships

Personality
Rex is a very reserved person. He is like this because he is afraid of his Fenrir. It is a well known fact that he cannot control his monster side, (Like Chopper's Monster Point Pre-Skip), and it flares up when he gets scared, angry, or feels threatened. To keep the Fenrir from coming out, Rex keeps his emotions to himself, prefering the facade of calmness and indifference. It's easy to spot when he's about to lose it, giving Rex, and the rest of the crew, time to lock him down before he causes another massacre.

Crew
Rex was afraid that he would kill the Devil Spawns, especially Senshi, when they first showed up. He "kidnapped" Senshi to try and convince her that the island was dangerous, but was surprised when they insisted on staying. When his fenrir was finally brought down, he was ready to accept death, but his life was spared. He realized he had gained something he never thought he ever would. Friends. Because of this, the Devil Spawns are his treasure.

Family
Rex's family left him when he was very young. He hopes to find them again somewhere on the Grand Line. He has encountered his elder brother Lupis William. In the beginning, the two were the best of friends, but then Will showed his true colors by trying to kill Senshi repeatedly. After discovering his plan, Rex confronted his brother. They dueled, and Rex came out on top, in the end, slaying Will.

Allies/ Friends
Rex never trusted himself around people after he ate his devil fruit. Anyone he ever befriended outside of the Devil Spawns, has died an untimely death at his hands. Because of this, the only ones he feels he can trust are the Devil Spawns

He does have a particular connection to Drake of the Skyline pirates. It was thanks to him that the nightly visits from the fenrir became a thing of the past.

Enemies
The families of Rex's victims, most of them being marines and bounty hunter, want Rex dead because of what he's done. Also, because of his uncontrolable monster, the World Government views him as a hazardous individual with intentions of destroying everyone and everything in his path.