Recommendations Light novels with lead characters like Yukino Yukinoshita

The title explains everything. Apologies if this has already been asked previously, but in my rudimentary searching techniques, there was no reliable compilation of said characters.

That said, I'm looking for rational protagonists that are intelligent and perhaps even cold. I've recently gotten sucked into the rabbit hole known as Oregairu fanfiction but thought it would be wonderful if there was another light novel that exhibited a similar energy as this character.

Thank you for your time,
Kelvie

 

Youkoso Jitsuryoku Shijou Shugi no Kyoushitsu e

 

mangas, novels or animes ?
Do you mind chinese and korean types ? or focus on japanese?

 

Any media really. Language is fine as well. However, due to the increased cost of animating or drawing, I would think novels should be the most plentiful and easiest to find.

 

Thank you for your suggestion, I'll give it a try.

 

Utsuro no Hako to Zero no Maria
Dungeon Defense