Oh my goodness these are amazing questions! aaaaaaaa!

How does the FOB feel about normal birds? 

Is Uthrek's basalt hand lighter or heavier than his normal hand, and can it ever break?

I just call it basalt, but actually it's quite porous and it's more like a halfway point between a basalt and a pumice! As a prosthetic arm it's actually rubbish; it's basically there to be a paddle for swimming (and to quote an amputee's post about the subject I read once "to not freak the normies out") and isn't really useful for anything else. It's lighter than his other hand and quite brittle, one good smack and it might break in half. Uthek made it when he was out in the wilderness trying to survive and was still kind of dealing with the trauma of no longer having a hand. These days he still has it mostly because if it's not broke why fix it? It's also weaker than it used to be because the bubbles inside the rock give it a depth limit; once they get into really deep water the pressure starts making little fractures everywhere, and because he's done that a couple of times the thing has gotten real flakey. Basically it's a piece of junk and he should throw it away but won't LOL.

Would Klugg be able to break a watermelon between her thighs?

What's Dupac's favorite potion?

His favourite is the invisibility potion, because it means he can get away from danger without fighting anything and stay safe without having to run around a lot like with a swiftness potion (which is much easier to make). It's very hard to get the gold for it though, so he purchases them mostly from wandering traders (when he can afford to) and saves them for when he really needs them. It's very rare he has more than one though, and once it's gone it's gone. Most commonly he'll use swiftness potions and poison/harming potions, because they're quite easy to make. (Don't ask me how he gets the spider eyes, that's secret witch techniques no doubt.)

(my first instinct was to say Loki, but Loki literally doesn't like anything other than human blood so that makes no sense asdfd)

For being a manifestation of spiritual nature energy or whatever, Happon is pretty terrible: He's 550 years old and still hasn't learned how to cook properly, and in modern times subsists on convenience store food and snacks. Fortunately Kuro enjoys cooking and supplies him with actual sensible meals whenever they're staying together.

Morris takes things to a different level by eating things that living organisms generally aren't supposed to eat: thanks to his geometrid biology he's able to process all kinds of weird chemicals, and he's especially fond of things that are more uh "active"; i.e: corrosive, unstable, and most of all radioactive. He loves radioactive foods, especially meat, he calls them "spicy". He's also very fond of flammable chemicals, especially kerosene.

Honorable mention as well to Doctor Og, who I don't think is a much squad gremlin but certainly could eat a lot of weird shit if he wanted to.

(sorry for the delay I really wanted to draw this picture and never seemed to find the time sdhfgds)

Generally the more detailed and tiny, the more she's fascinated by them, but she in particular likes ships and cute animals!