I don't necessarily think he'll be a bad guy per se..... However, these overly "hero" type of personality guys are always the same.... Forcing their sense of justice of right and wrong onto other people to the point of annoyance or getting used by the Kings/Emperors to wipe out their "evil" enemies, without thinking for themselves what it is they are actually fighting or killing.
Also, I feel like he is going to be a person "interested" in our MC, since it's specifically stated she isn't married yet. So, probably either going to be a super jealous BF/fiance or super jealous guy Savior. I doubt he would, but I could also see him abusing his status as a savior to try to wedge in between the FL and our Knight. Sort of makes me wonder that eventually when the FL and Knight get married, even with the Male Savior trying to separate them gets mad to the point that he ends up going to one of those kingdoms that want a Savior for world domination. Since that was also stated specifically in this arc as well.
Anyways just sort of threw my 2 sense on this new arc... Someone @ me if you know or have a thought on it.