They're left-handed leaning towards ambidextrous. They melee pretty solidly with both hands but their right-handed aim for ranged weapons is notably weaker.
Affection through touch and transference: tumblr post
Their weird relationship with having a body: tumblr post
They strongly dislike going to Deimos, both because Higgins isn't treated well there and because they're forever pissed that the person whose stories in their original timeline had literally saved them is actually just a giant asshole.