Rin is half-demon with a very short temper. In the past he has gotten very violent when he has lost his temper, not to the point of killing anyone but he has definitely put people in the hospital (including his own father). He also feels responsible for his father's death because his father died saving his life.
There's more stuff too but it's SUPER-spoilery, so the general feel of it is "he's got a lot on his plate and probably doesn't deserve half of the crap he gets." If you want more details I can fill you in though.
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Rin is half-demon with a very short temper. In the past he has gotten very violent when he has lost his temper, not to the point of killing anyone but he has definitely put people in the hospital (including his own father). He also feels responsible for his father's death because his father died saving his life.
There's more stuff too but it's SUPER-spoilery, so the general feel of it is "he's got a lot on his plate and probably doesn't deserve half of the crap he gets." If you want more details I can fill you in though.