Hannigram each having a natural talent: Will with his eidetic memory and hyperphantasia, Hannibal with his perfect pitch and hyperosmia. I headcanon them on the run playing games here and there and getting weirdly competitive when either of them excel at what they can do naturally.

It tickles me to imagine Hannibal training himself for years in order to draw from memory meanwhile Will does it as easily as breathing. His default mode is vividly imagining literally anything he’s ever seen, and Hannibal’s like, that’s cool :D (he’s a sore loser).