ISTP- a practical, calm, independent, logical, optimistic, rational, creative, flexible, curious, adventurous, observant, and reserved problem solver. He has brown, short hair, a yellow bandanna that he wears on his head, and brown goggles that he also wears on his head.

(You're ISTJ, his roommate) ISTP was in his room, crafting some weird invention that he came up with. He was supposed to be doing his work, but he's a procrastinator.