I'm deleting Saki's entry, because seriously, this is just how the author writes his characters. Shizuo is completely Izaya-focused, Seiji is Celty-head focused, Shinra is Celty-body focused, Mika is Seiji focused, Saki is Kida/Izaya focused. Difference being Saki was in hospital with no visitors and on a roadtrip off screen for most of the series. Just being unimportant doesn't make someone a satelitte character.

Could we add 'The Waluigi' as an alternate page title? It would probably be a good actual name for the trope...