I suck at fandom playlists but that doesn't mean my brain makes some associations between music and famnish things so here's a short list while I listen during work
[P3]
Shinjiro/Akihiko = Running Up That Hill by Placebo
[mainline] Lucifer and every mailine protag = Follow the Cops Back Home by Placebo
A FST associated Placebo's Sleeping With Ghosts with Jenna Angel and Gale/David and, fair. This is my go to song for tragic soulmate type relationships so you bet your sweet beppy I also associate it with Shura and Futomimi 