I know people will say not to, but I TOTALLY pet Alejandro. (After I wash my hands, use a nail brush .. . and rinse the soap off really well since they say soap is harmful.) I pet him by softly letting him swim by my finger, then I cupped him and now he will swim into my hand and rest there a second or two just like he does on his leaves or hammock or other things in the tank. He is my friendliest betta, and the one that seems to be pleased or at least curious and not angry when he sees me near the bowl.
He also comes right up to my hand when I drop his food in. I guess I sort of train him to "get it" when I am giving him food. He is on my nightstand in a 5.5 gallon and I don't know if being close to me more than my other tanks makes him friendlier.
I often think it stinks you can't ever tell before you bring them home who has the best personality. You just have to be lucky. :)