Carmen is a filler character who was a rival cook of Zeff's, and eventually of Sanji's as well. She only appeared in episode 51 where she challenged Sanji to participate against her in a cooking contest. [source: http://onepiece.wikia.com/wiki/Carmen]
Sakuya's classmate. She seems to be the most level-headed of the group. She and Masumi are childhood friends. It is hinted that she might have a crush on Masumi.
Isako's mother. She has been raising her daughter alone and has been doing multiple jobs, since Isako's father died.
A younger girl who is in deeply infatuated with Kanade with the point that she is almost stalking her. She is extremely wealthy and often tries to spend her money after the twins. She likes collecting old paraphernalia, junk and pictures that belong to Kanade, most of which goes to her makeshift shrine. Despite her overwhelming presence, the twins seem to like her. Yukino is amused by her and Kanade seems more irritated than anything, but they both seem to have some sort of affection for the girl. Initially, her presence was seen as a threat to Kanade as she assumed Sakuya was interested in Yukino. She became aware that Sakuya was madly in love with her when Yukino clears the situation up. Sakuya also was feelings for Isako Mikanagi shown in the spin off of the main story, where they share a kiss as a result from her confession when Isako moves away.
You first meet Canta in Ground Zero when she mistakes Id for an "flat chested girl". She is one of the six fragments of chaos. At first, you think the girl is called Canta but later on, you find that the bear is actually Canta's main body and the girl is the artifact (called Morkana). Because of this, the teddy bear is controlling the girl and can perform 'teddy bear magic' which has no casting time. This means it is hard to attack or defend.