User blog comment:DarknessStriker/Which support should I choose?/@comment-9048637-20130520180835

Thresh can do just about any role, honestly. Probably not jungle Thresh, but top lane Thresh, mid lane Thresh and even ADC Thresh all work out surprisingly well. None are probably quite as stellar as support Thresh, but I'd definitely say they're viable.

Kayle's if anything even more versatile - I'd probably never build her straight ADC, but anything else, she can do, including support (though arguably, despite her tag, it's her weakest role).