clumsy and st00pid-ness are cute
non-human/inhuman gap moe alongside kuudere and intellectual traits especially with essence of robotics, aliens, monmusu, magic, dolls, etc.
Clumsy and slightly retarded girls really are consistently my favorites.Usagi and Minako (Sailor Moon), Doremi (Doremi lol), Nozomi, Miyuki, and Ichika (Precure, also I'm being a bit unfair to Ichika by lumping her in here since she's not particularly retarded, unlike Nozomi who got a 18% on a test), Yuuma (Magipoka), all moe.