We all know a Krile, a Thancred, and an Urianger in our lives. They are flawed people, but they are also good-natured people. Krile reminds me of a girl who had some self-doubts of her abilities but she didn't constantly mention it, and she still tries her best. Thancred has minor anger issues and is over-protective. Urianger is a nerd who is socially awkward and finds it hard to open up. These are all traits and personalities we can find in our lives.
What about the other three ?
Y'shtola is a walking encyclopedia who will talk back to gods and humansplain a god's motive back to the god. Her explaining Hydaelyn's motives in front of Hydaelyn herself was the cringiest thing I've ever witnessed.
G'raha is an obsessive fanboy, I literally don't know anyone like him... The burger scenes are whatever, but him constantly talking about how he wants to adventure with you is borderline creepy.
As for Alphinaud, no he is absolutely not relatable at all, he's way too idealistic and naive and he'll go into monologues on peace and cooperation, the only thing he reminds me of is people at UN making speeches imploring us to do X or Y (for a good cause, but it's still very unrelatable).