Underfell! Sans Personality Type, MBTI

Underfell! Sans personality type is ISTP, heavily hinted to be more feral than even the most feral of the pack, though he is far more amicable than his brothers (and of course, he's the only one of the two that's not a male). He can be quite amiable, if not downright charming, but is always direct and straightforward. He has very few words to describe emotions, but his actions are more than enough to show what he's thinking. He's only willing to play the game on his terms, and he'll fight tooth and nail to win even if it means hurting his allies. He's surprisingly adept at negotiating, though he'll never back down from a fight, even if it means hurting his friends. He's also surprisingly loyal, though he's willing to betray them without hesitation if it means winning. He's definitely not the most patient of people, but he's certainly focused.