Author has written 5 stories for Naruto, Code Geass, Bleach, and Beauty Pop.
I write mostly about bonds between characters. My favourite thing to do in a fic is explore a character, their personality, motivations, thoughts, feelings, and especially their relationship with another character. However, I tend to avoid the whole romance side of things because A) I'm vaguely uncomfortable writing romance and B) You don't need two people madly in love and wanting to screw each other for them to really, honestly care about one another.
My favourite bonds to write about are those I feel aren't explored enough in canon or fanon. If there's already a ton of fics on the characters in question, I generally don't feel I have anything to add (unless a plot bunny grabs me and won't let go). Of course, absolute fic number isn't the best indication. Best example would definitely be Uchiha Sasuke from Naruto. There are tons of fics on him. Unfortunately, not as many on him and Team 7, which is the reason I fell in love with the Naruto series to begin with.