Everyone's got an aesthetic. Sunsets, the color red, thunderstorms, memes *glares at no one in particular.* How about your characters?
This could also involve theme songs that match this aesthetic, suit their personalities, or just fitting for when they dramatically enter a room.
As for my own OCs...
Scuttle: Little Fang - Avey Tare's Slasher Flicks, Horse With No Name - America, Meet Me In The Woods - Lord Huron, Handlebars - Flobots
Lenny: Sound of Silence - Simon and Garfunkel, Bruno is Orange - Hop Along, Still Alive -Portal 2
Wilson: The Sailor Song - Toybox, Come to Me - Goo Goo Dolls, Hips Don't Lie - Shakira (he's a SASSY girl ok)
Bullroarer: The Ballad of Jeremiah Peacekeeper - Poets of the Fall, I'm So Sorry - Imagine Dragons, Somewhere Only We Know - Keane
Tont: Always Gold - Radical Face, Blame - Air Traffic Controller
Enkidu: Grown Ocean - Fleet Foxes, The Yawning Grave - Lord Huron
Sorry if there's already a topic for this. Search didn't bring up anythin' recent, so....