You can't pick your clan...

An idea I’ve seen a few times - a Vampire game where players generate mortal characters and then have clan assigned randomly or by the Storyteller. It can work, as long as the choice doesn’t invalidate what the player wants to do. My example is a highly social character becoming a Nosferatu - which can happen in the Vampire: The Masquerade setting but probably isn’t what the player wanted when they filled in those Appearance dots. Most concepts can fit into most clans with work, but some are definitely more work than others.