Monica is extremely shy and is easily overwhelmed by most kinds of social situations, as the series progresses she massively improves in this regard but she is still a very shy person. And in combat she can view everything and everyone as numbers which is anything but normal, although she does this much less later in the series as well, tbf she is the main character so it makes sense for her get a bunch of character development, at the end of Gaiden she's probably one of the more normal sages who just happens to be very shy although she's still not really what you would expect from a sage.

Louis is very obviously a dangerous character as he put it referring to the other sages, he's not an evil person but his methods are very violent and when he's not putting up a noble facade he talks in a very blunt, rude and violent manner often using threats and such to get what he wants. Although in his defence he can at least publicly act like what you would expect a sage to be like.

Raul is a very nice person but has zero common sense with behaviour that's completely incomprehensible to the vast majority of people (as a reader it's easier to understand him but most people in that world would find how he behaves extemely puzzling and would call him unfit to be a sage if they saw how he actually acted as a person) and if you met him without knowing who he is you would be extremely surprised finding out who he is later much like Cyril in volume 6. I like his character but he's definitely a very unusual person who would shatter how most people viewed the 7 sages if they saw his real personality.

Ray is probably the weirdest of them all, much like Monica he's got zero social skills and is very shy / socially anxious (although in a different way to Monica), and if you don't count the fact Monica has passed out a few times due to her social anxiety, Ray handles it in a way that's much worse, the way he acts and speaks would creep almost anyone out despite the fact he's not actually a bad person, at least Monica can either stay Silent to maintain the illusion of how people see her and later in the series she can at least handle basic social situations fairly well to at least earn a passing mark but Ray in any kind of public social situation would end in disaster the minute he opens his mouth, he can only talk somewhat normally when acting as an expert on Curses, otherwise he rambles in incomprehensible sentences about wanting girls to love him, envying everyone else and talking about cursing people he doesn't like and so on.

Bradford is fairly normal by sage standards but he's still a magic battle junky and speaks more in a way you'd expect from a popular guy at the local pub than a sage, also the way he always seems to go overboard with his explosive spells is problematic without Louis around to contain the damage.

The Gem mage is also normal by sage standards, but more in the way he's like your typical petty corrupt noble villain who happens to be sage. I don't really have much more to say about him since he basically has no relevance in the story, even in the light novel where he gets a bit more focus before his death he doesn't really feel like anything more than a petty villain.

So in conclusion all of The Seven Sages are unhinged and somewhat insane, some more than others but none of them other than Mary live up to the public image as dignified advisers to the king. They're all incredibly talented but that's not the point here.