Their combined obsession either pushes them toward massive success or threatens to consume their entire social lives.
Two characters who both possess heavily flawed, obsessive, or intense personalities and find solace in the fact that they don't have to pretend to be "good" around one another.
Betty and Jughead from Riverdale (their shared obsession with murder mysteries and investigative journalism) or Chuck and Blair from Gossip Girl (their shared love for Machiavellian schemes and social warfare). 2. The Morally Grey Soulmates