"What is their biggest fear? What in general scares them? How do they act when they’re scared?" for shiba and "Do they have any special diet requirements? Are they a vegetarian? Vegan? Have any allergies?" for brutus ;0
Shiba is a pretty tough cookie, but he is genuinely afraid of managing to get himself a prison sentence of 5+ years. While his lifestyle works for him and he understands the risks, he’s only 19 and would really hate to be stuck in jail for too much of his life. As for other fears, Shiba hates jumpscares.
Brutus is allergic to shellfish, which makes him pretty sad because before the allergy developed he really loved crab. He was having a lobster dinner on a first date when he was 16 and promptly broke into hives and had to be rushed to the ER. Needless to say, there was no second date.