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For the purpose of LOS, precision shot, etc. I would assume no, but couldn't find anything either way.

Doesn't seem like it; only the Nobz actually leading squads are characters (RB FAQ p2). I don't see anything in the rules to suggest that one of the Nobz in a mob of them is the leader, so I'd say no.

Nope, no characters.

not unless you put in a painboy, he's a character.