Can I fall in love with someone who is not attractive?

of course he can, its called not being shallow. Besides when he does finally fall in love, if he didnt find that person very attractive at first, for some reason his love will make him physically attracted to you, sometimes because of small things. (example: nose, cheeks, eyes, hair.) When you fall in love you cant help but to realize all the little things that make you love them even more.