Todomomo

Momo is big spoon on winter night. Summer nights she's the lil spoon.

Kirimina

He's big spoon because she doesn't like being big spoon

Miruhawks

Rumi is always little spoon. Sometimes she's sandwiched between her husband and their baby/toddler daughter.

Iidamei

Mei is big spoon, can't tell me otherwise.

Kamijirou

Jirou is small spoon.

Dabi x Toga

Toga is small spoon. She's not big enough to comfortably spoon him.

Nejitama

She spoons him. He doesn't want a face full of hair.

Mt.Kamui

Splinters exist. Yuu has to be baby spoon.

Ryushot

Rise up

Ryuko is a big spoon and that is fact.
They probably sleep like they're hugging though. That'd be adorable.

HitoRei

Reiko is baby spoon because she's tiny compared to him.

Tetsukendou

Kendou is big spoon, facts