Most of them have little to no personality, but what's more is that there's pretty much no VARIATION in personality, at least as far as the protagonists are concerned. Almost all of them canonically align somewhere between lawful good and neutral good. I can't comment on fire emblem because I've never played it. Olimar is just kind of a guy who explores, but he expresses literally no personality whatsoever and doesn't have to battle anything explicitly evil so he's kind of hard to place.
There's a bit more variation in the sidekicks and the villains. None with any noteworthy amount of depth but its there a little bit moreso.
There's a bit more variation in the sidekicks and the villains. None with any noteworthy amount of depth but its there a little bit moreso.