Kirigaya Suguha's room is often portrayed in the ALO arc of Sword Art Online.
When Suguya is in her room, some stuffed toys are visible in the background.
Penguins resemble those from Mawaru Penguindrum, even available as stuffed toys:
However, the animation studio is different and the link between the two shows is not clear to me.
What are these stuffed toys? Are these a citation of other anime or universes related to Sword Art Online production?