Ok. here we go

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In my mind, he has medium length, straight red hair instead of his cannon depressing baldness (I'm sorry, I had to)

He is staying at 6'10. you can't change my mind.

He wears a black ski-mask under his hood. just incase it gets ripped.

He gives awkward pat pat hugs, mainly because he's so damn tall, and doesn't like physical interaction with people (he's antisocial)

The people he works with thought he was soft when he first joined, until they saw him on the field.

Sometimes, at the base, he likes to do target practice with a sniper rifle, instead of training for his on-field function; being a human battering-ram

Never thought twice about smoking... he doesn't mind other people doing it, he just doesn't like the smell and would rather not be near them.

No jewelry. (other than his dogtags) he doesn't like the feeling of anything cold against any of his scars, and in general, doesn't like the cold.

His mask gets damaged so much that he constantly has to sew it back together. Over the years, he has gotten better at sewing, and his teammates come to him when they need clothing, or a rucksack (backpack) sewn back up.

Would paint your nails as you gossip to him. (if your into that kinda thing, lol) He likes the smell of nail polish, and thinks painting people's nails is calming, and a fun hobby.

When people ask about his bad scars (the ones that still hurt sometimes) he says he got into a car accident, or just a motorcycle crash way back when. Mainly so people don't worry about him being too hurt, but it almost always backfires, because they want to know how he got into said crash. (again, he's antisocial)

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Alright! that's all, thanks for reading you beautiful people!