If the anime gets a simuldub from Funimation I think that Justin Briner should talk for Rimuru since his voice isn't too deep and he did well as Eru in "Knights & Magic"
Magic Haki at that. It's why Fuse is so pissed at the end. In the WN it's explained that channeling magic through your weapon like that is REALLY difficult so him casually doing it makes him overly stand out.
zzzzz.... getting through the children arc feels like it is going to take forever. It's funny seeing Fuze-sama added in to the recent scenes though. More author to go around.