Doraemon

D-Frag!
Due Chitose says: All mine is mine, and if he also has something that isn't needed, so that it's also mine!

Then featured Takeshi Gouda (Gian) from Doraemon to accentuate Chitose's image.

Nekomonogatari White
In episode 3 of season 2, Shinobu compares Napoleon to Shizuka based on his bath love.

Nadeko Medusa
Nadeko also makes a reference in episode 11

Hitagi End
then Nadeko refers to it again in Hitagi End 2, saying that Nobita played cat's cradle and text came up related to it

No Game, No Life
Due Jibril say to call Stephanie Dola as Dola-chan (spelled Dora), then featured Doraemon.