Most characters in the series are in shades of grey; even Ned fathered a bastard. I'm trying to think of characters that are purely good. Jon, Bran, and I guess Hodor seem to fit the bill, though Hodor's the only one I would be surprised to see partially corrupted!
That said, I think it's fair to say that Tywin is eviler than Arya; she wants to go home and she wants revenge, but Tywin is driven by greed.
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No I'm not a damn furry. Looney Tunes are different. - Guiga
I wanted Sonic/Shadow romance at that time, not sex. - MWE