Not sure if there's a common English equivalent to the term dame-kawaii, so just went with a literal translation ("cute but useless"). If someone knows of an established equivalent feel free to change.

Tragic Junko.

Bicorn said:

dame-kawaii ("cute but useless")

Is that the term for the trope Hiroi Kikuri and Saku from Dekineko fall into? I didn't even know there was a term for that

wadahishi said:

Is that the term for the trope Hiroi Kikuri and Saku from Dekineko fall into? I didn't even know there was a term for that

It's become a pretty popular archetype lately. Aqua from KonoSuba is probably the most well-known case.

Bicorn said:

Aqua from KonoSuba

I'd struggle to describe Aqua as cute. Any charm she might otherwise have dies a quick and horrible death as soon as she uses her pea-sized brain to say or do anything.