At first, Christina thought that Aoba hates her for giving Kou the Key Visual Designing job that should also given to the Lead Character Designer. She manages to get along with Aoba after visiting the Character Team booth with the help of Mozuku and Kou.
Likewise as Aoba, Christina thought that Kou hates her for forcing the key visual designing job to the latter. Kou manages to get along with her and even help her to do so with the whole character team.
Christina and Shizuku get along very well. 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.