Expy: Of sorts to Doraemon, as pointed by various references through the series. She comes from the future to prevent Sakura from turning out bad much like how Doraemon did for Nobita, but for twistedly nonsensical reasons.
Nice Guy: Grows fond of Dokuro despite how she treats him and brings food to the homeless Sabato when she's not looking, since she's not a bad person either and he feels sorry about her having to be stuck in the past unless she could kill him.
Ill Girl: Frequently, particularly in season two. It's mostly just a cold, but it's exacerbated by her less-than-ideal living conditions. Like just about everything else in this show, though, this is Played for Laughs.
Everyone Has Standards: When Sakura tells Shizuki about how he doesn't want Zakuro to take Dokuro back to the future, Shizuki quickly reminds him that Dokuro has done nothing but cause him pain and trouble since her arrival.