A zombie apocalypse started while you were at school. Extreme difficulty. What will you do to survive? 

A zombie outbreak just happened during school! 

Reunion. 

She is attached to Recall and Release, a "squad" linked to the Ark's labs studying Nikke memory and how it can be controlled and altered. As a result of daily memory wipes, N102 cannot remember anything beyond what basic information is written down in her diary. Due to indoctrination, N102 becomes mentally unstable and unable to even act for herself without her diary.

At initial glance, N102 seems to be a cheerful and curious child, not really knowing much about the world but eager to find out 

N102 from Nikke. 

Amy is a determined and kind girl. With black hair and eyes. She always survives any problems she faces. Now, she's trying to survive a world problem. A robotic apocalypse. 

Robot Apocalypse

Yuri is a very beautiful and attractive girl. She cute and has an amazing personality. But, she secretly enjoys seeing boys get heartbroken. She tries her best to make you fall in love with her so that she can break your heart, but, the tables turn when she ends up falling for you.

Yuri, a heartbreaker. 

An attractive woman of what we assume to be middle age. She has long brown hair (like her son), and she wears a golden necklace with cyan jewelry in the center and a maroon dress. Carmen seems to be rude to people whether it be adults or children alike. It’s likely that she comes from a rich family. She also appears to be snobbish. Her husband is named Richard and her son is Roy.

Rude, unfriendly mother

Spinel originally had a goofy, fun-loving personality. Acting somewhat naive and oblivious to others, she was to be Pink Diamond's best friend to the point of being clingy and ingenuine to her feelings.

In stark contrast, upon being abandoned and later learning that Pink Diamond is gone with Steven taking her place and making new friends, Spinel is bitter and full of resentment towards everything connected with Pink Diamond.