It goes by types:
Puppy (the cute pet who's also a beast in bed)
The Shy Virgin (pop that cherry bitch!!)
Husband Style (darling, I'm home!)
The (not that straight) Straight Guy
Sharp and Serious (quiet and upright, can't imagine them in bed until they actually get there)
Princess Like (semes that are feminine)
D.A.D.D.Y (rich, sexy and mature? Fuck me)
Confident and Full of Desire (they are sweet and they are here to make you fall in love)
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.