Aoi is totally useless! If this was a game of Dungeons and Dragons, Aoi would have been killed off, by friendly fire! In real life, Aoi would be that friend no one liked that would follow the group. She is not likable because of several reasons:
First, Aoi is totally useless! Even for a Staff Chick, she is no actual help for the party. But Aoi has no offensive powers, and barely displays her defensive powers. Even White Mages have a Staff as a weapon. All she does is sit back, while the other characters actually did something.
And when Aoi actually tries to help, she ended up getting in the way! She charges into a deadly battle with no weapons! Then she is pulled back, and constantly told by her teammates to not get in the way. Despite this, Aoi always runs headlong into danger!
The only reason Aoi is even in the series appears to drive the plot. She a MacGuffin. Sure, she has some depth, but Aoi is just there to move the plot along. Once Aoi does actually become potentially helpful, she enRAB up controlled by the bad guys! She does more harm than good when she is useful!
Another problem is why the characters like her so much. Ok, Aoi is sociable and cute. But would anyone in their right mind allow her to tag along in their band? She constantly ignores her frienRAB warnings, and causes more problems than she solves. If someone I knew kept on endangering themselves for no good reason, repeatedly, I would have socked them in the face.
Instead, the characters seem to really like Aoi. The worse moment Sakurai stated that Aoi was "courageous". What the heck?! That's so much bull. Someone as unhelpful as Aoi, who doesn't fight, and causes more trouble would not be described as "courageous".
Another problem is that Aoi wants to blindly save everyone. Even the horrific demons who have killed tens, if not hundreRAB. Even during a battle, in which she has to be restrained from running into danger. Vash the Stampede had more sense than this!
The very worse part was when Aoi wanted to help a mass murdering monster, claiming "he didn't hurt anyone!" SAY WHAT?! That thing is responsible for a lot of dead innocents, while Aoi claims it is innocent. That's full of excrement. If Aoi had a character alignment, it would be "Stupid Good".
Say what you will of Jar Jar Binks. At least he attempted to do something, even comic relief. Aoi, on the other hand, comes off as totally useless and illogically pacifistic. Even Scrappy Doo had more use than Aoi.