All the Marauders (even Peter!): I love the Marauders. I love writing about them, reading about the, everything.
Lily Evans:
The Black family: From Sirius and Andromeda to Bellatrix and Narcissa, I just love the Black family, no matter how evil they are. They're fascinating.
Tom Riddle: Okay, I admit, I think he's cute (because of the movies). And my current OTP is Tom/Ginny. It's just, he's so intriguing.
The Founders: Hey, they created Hogwarts! And they're so mysterious, a lot can happen in that time.
So, as you can see, I love the past because you can do so much with it.