I've only ever read some of the Baccano! light novels lmao so I guess those are my favorites. I didn't finish all of them though, some I just skimmed. I think I still have the translations saved somewhere, I should finish the ones I didn't read...

ooooomg wait holy crap I've also read the Only the Ring Finger Knows novels bc I'm trash and I own like 3 of them from my high school days I'm laughing at myself omg I forgot about those. I think this calls for a reread now.