Nigel: i'm sure his hands always feel weird when relaxing them after having them tensed up, clenched and/or tight gripped against a weapon the whole day. He doesn't have THAT many bruises asides from scrapings and non active cuts from missions. They're sweaty, surprisingly— specially when he's holding something. Injuries are more present in different parts of his body rather than on his hands anyway.
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Hoagie: Since he's always making gadgets, using all sorts of tools, polishing machines, etc, i don't think that his palms are soft. His fingers are always moving here and there, fidgeting with whatever long objects he has nearby; his hair, his cap, a thread, etc. I took the self harm cuts from @spicedwatermel0n 's headcanon, since it actually fits so much. The cuts are ocassional, only after a really bad day inside his room (like after getting beaten up by his grandma)
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Kuki: slender, delicate, long and soft! Her hands are always covered by her sleeves, and she practically does and grabs everything with those, so there's no active harm (maybe??). Her nails are long and pretty... But sharp!! She can scratch and i assure that it hurts. Her hads, despite being delicate at first sight, are always moving around and hitting stuffs as a stim. They may feel a bit greasy from always fidgeting with her hair. Still, she takes good care of them.
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Wally: Now these are some bruised hands. His knuckles are always damaged from punching stuffs, he's neglectful of his health and doesn't really do anything to heal them. Bruises all over the wrists, but they're more present on his chest, stomach, back and legs. Despite not being someone thin— he actually is slightly chubby, his wrists don't really show that. They're very slender, and he feels a little embarrassed of that. Everytime he punches or lifts something it looks silly to others, so he's always with long sleeves, which he also wears to hide the injuries he has. His nails are probably really dirty. Also, i forgot to mention, about him using really long sleeves, it pisses him off a little to hear people asking about the injuries or insisting in helping him. He always tries to be absolutely independent, but he lowkey fails.
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Abby: Abby's hands are an in-between Nigel's and Hoagie's levels of harm. There are non-active cuts from missions and slightly bruised knuckles, her nails are small and, i don't know how to call this, but the skin around them is slightly darker and raised— my fingers are like that and i have no idea what it's called lmao. Anyway, despite her hands being rough from years of fighting, they're SO gentle. She can comfort those in need with a few caresses. Despite always having them clenched during missions, she KNOWS how to relax them, unlike Nigel. She's just chill.