Mukhtar has three, one is minor and the two other is vast.
The small trait is that he's such a tease on the girls. Though we have seen it only once, it's stated that it's done more than once:
The biggest one is his curiosity, and he done it numerous times and some nearly leads to his death and also a danger to others:
1. Wants to check the insides of a Centipede serpent:
2.Nearly got cut into pieces by a djinn carpet with sharp threads:
3. Entered the storage deck under the crew deck to see some valuables. Only to have his body controlled and almost unleash a powerful djinn:
4.Drink mead to know its taste:
The last trait is that he keeps his situation to himself. Selfless yes, but not a wise move:
He got his back shredded by a hippolion:
Although he survived, and recover his wounds with alcohol and bandages, it is not enough to stop the bleeding.
Despite this, he still keep it to himself to make sure his mother recovers fully from fever. He doesn't want her to get worried, believing that telling her would make her feel worse.
Worse still, he fights a boy to teach the bully a lesson and got his wounds open again:
He still won, and make friends with the bully (sort of).
Nevertheless, his wounds is now bleeding:
Luckily, his brother stole a high quality medkit, and his sister is an expert for handling wounds like these:
Despite his flaws, I still adore him, and his siblings.