I dunno. Reason is a great tool, but the brain is a neural net, a pattern recognition device. It's not based on logic or reason, though it can use them to verify insights. What we think of as logic and reason are really mostly learned skills. The insights offered by IQ seem more to be more inherent things.
IQ also has to do with speed as well as reason. A way to detect IQ is how fast a person thinks. It's not great though because most of the time, people are not in stimulated states, so you can't always tell if a person is more intelligent than you that way. If they hit the gas though, you can get a feel for their speed and IQ.
That we don't often see a person in a stimulated state is a blind spot, especially for intelligent people because they don't often meet people that can accelerate past them. One thing that is pretty universally visible is emotions though, as they are meant to communicate. If you want to judge IQ, feeling the strength of a person's emotions is very similar to sensing the speed of their thoughts. I've found it to be a very reliable way to sense IQ.
As for character, I'm all good with that, but I tend to also study that as perhaps related to intelligence but mostly different and based on a slightly different neural net, the way the speech center or vision is based on rather segregated neural nets in the brain. Character is a big part of morality. While there is intellect involved, moral instinct is more useful for managing character than intellect or reason. It can be more of a trial and error thing and the reason for what works for character may not be obvious to reason. A person's morality and character is the union of their moral instinct and their moral training, nature and nurture. The best training for character comes from phislophy, a rather neglected subject just now. Circling back, you could argue, and I would, that superior moral instinct would be associated with superior intellect and IQ. That is not universally true. Some less intelligent people can have very highly developed and highly trained moral instincts. Still, moral instincts were much of how humans solved survival problems before a more developed neo-cortex provided greater intellectual ablity to creatively solve survival problems.
