"If opposites attract, then the correct strategy is to be a loser"
A list for opposite pairing tropes
001 - 028 :: delinquent x honor student/nerd
029 - 071 :: outgoing x serious
072 - 101 :: popular x unpopular
102 - 118 :: rich x poor
119 - 134 :: scary/tough x cute
For personalities that are opposite to their appearance, here’s my Gap Moe list: http://www.mangago.me/home/mangalist/1124861/
When seme (or male lead if it's shoujo/josei manga) regretting all the bad thing he has done (especially to his significant other) and trying to make amend of his wrongdoings. Some of the list has uke that is very forgiving, never forgive or died. I don't mind whichever ending, it's just the feeling of regret, from doing bad things or taking things for granted.
Most in the list are yaoi/shounen-ai genre, that's why I used term 'seme'. Feel free to add if you have anything similar in mind.