Most Helpful Guy
If you're repulsed by someone and only sort of like their personality it seems like you should just let it be. Of course he could grow on you. He obviously has since you're considering him as a partner.
Let it alone, if he grows enough that you start finding him attractive then you can ask again. Although there will be no need.
And yes, he probably will reach that stage. Girls seem rather capable of compromising on looks for some reason. Never got why.