In the manga of Katekyo Hitman Reborn! (also commonly just "Reborn!" for obvious reasons) after the future and Shimon Arc ends, the Arcabaleno Arc begins and reveals that:
Bermuda, the arcobaleno of the eighth element of night, bargains with Reborn in Chapter 384-ish to take his life for future generations and use his life to kill Checker Face.
While reading it, I noticed Bermuda calls all characters "-kun"! Since it's obviously a term more for guys, and yet it was used on Chrome and weaker players like Lal Mirch etc., I thought it was a little strange. I don't think it's a translation error either - since 「―くん」is pretty obviously "-kun".
Is there any explanation for this? Is it something to do with his personality?