Tropes list
Abusive parents: Yuki's major problems come from his family and their treatment of him leaving him with lingering problems.
Stepford Smiler: Making him a bit of a doormat who insists everything is okay.
Not so weak: But you shouldn't underestimate him because he is more than just smiley healer.
In the blood: With inherited additions it's not advisable to abuse his his girlfriend or his close friends because he is tempted to make problems go away.
Rosalinda: He really does love her enough to stepford fail.
Supreme chef: Yuki likes cooking but skips eating often due to homework.