Umiko Ahagon[]
Umiko frequently shoots or flicks Shizuki's forehead whenever the latter changes the games specs on a whim. Umiko often searches for Shizuku when she needs something and the latter is not in her office.
Rin Toyama[]
She is very aware of Rin's feelings towards Kou. She likes the Rin/Kou tandem to the extent that she supports, teases and set the mood for the two.
Ko Yagami[]
Shizuku knows that Kou is unaware of Rin's feelings towards her, and often teases them both.
Christina Wako Yamato[]
The two get along very well. Christina is one of the few people who has a higher authority than Shizuku. They're close enough to be drinking buddies. Shizuku is also the one who suggested she take Mozuku with her while visiting the character team booth.