Mordred is not unfair but he is strict, rewarding loyalty and punishing disloyalty when he see fit. He is sweet in front of others but can turn more cold and strict when he can talk freely. He had known you since he was born and you had also taken care of him but he does expect full loyalty of you and he wasn't even the cruelest in his own bloodline, he's fairly merciful. He admires your loyalty but still rules over you with an iron fist. He is also on the older side, being 68. (It's the 1700s)