ONE PIECE fans and their love for edge lords 
Doesn’t matter how strong you think said character is, everybody has fears💀. Hell even Kaido who mofos gate-keep here has fears
Kaido v Saint Killingham would’ve been peak
Anyways jokes aside 😂, good list ^^ @TheAncientCenturion
Mines would be:
Luffy - Sakazuki (most traumatic experience thus far was coz of him) / Nika’s arc nemesis (i.e would be interesting if the biggest fears of the Nika fruit manifests itself. For instance the demon on Elbaf’s mural 👌🏿)
Zoro - Kuina (he’s never beaten her b4, so fear lose to Kuina could potential manifest itself in the form of Kuina. Reckon it could be a nice lil fight to conclude that unfinished fight in Zoro’s subconscious hell could even use it as an opportunity to help Zoro what he lacks. Though I doubt Oda will ever write the latter.)
Sanji - Psychotic version of himself - Stealth Black (self explanatory)
Nami - Arlong 👌🏿
Usopp - thought of something destroying Elbaf? Evil Loki at 1% strength maybe?
Franky - Sea Train
Brook - Brook before he met the SHs (*reckon his biggest fear is solitude)
Robin - Rob Lucci?
Chopper - Evil Cotton Candy? 😂
Jinbe - some racist Celestial Dragon that’s actually strong?
That said, hope not but chances are that Kilingham’s fruit can only manifest the fears of those who he puts to sleep given the children were falling asleep 💀

Doesn’t matter how strong you think said character is, everybody has fears💀. Hell even Kaido who mofos gate-keep here has fears

Kaido v Saint Killingham would’ve been peak

Anyways jokes aside 😂, good list ^^ @TheAncientCenturion
Mines would be:
Luffy - Sakazuki (most traumatic experience thus far was coz of him) / Nika’s arc nemesis (i.e would be interesting if the biggest fears of the Nika fruit manifests itself. For instance the demon on Elbaf’s mural 👌🏿)
Zoro - Kuina (he’s never beaten her b4, so fear lose to Kuina could potential manifest itself in the form of Kuina. Reckon it could be a nice lil fight to conclude that unfinished fight in Zoro’s subconscious hell could even use it as an opportunity to help Zoro what he lacks. Though I doubt Oda will ever write the latter.)
Sanji - Psychotic version of himself - Stealth Black (self explanatory)
Nami - Arlong 👌🏿
Usopp - thought of something destroying Elbaf? Evil Loki at 1% strength maybe?
Franky - Sea Train

Brook - Brook before he met the SHs (*reckon his biggest fear is solitude)
Robin - Rob Lucci?
Chopper - Evil Cotton Candy? 😂
Jinbe - some racist Celestial Dragon that’s actually strong?
That said, hope not but chances are that Kilingham’s fruit can only manifest the fears of those who he puts to sleep given the children were falling asleep 💀