She's a bit too thirsty and her insecurity isn't the cute kind but the obnoxious kind.
Still an amazing girl, but not flawless.
The ending for this series is already obvious-- the protagonist grows and grows as a fighter, for a time his feelings get stronger for Aiz, however, eventually he surpasses her and begins to have feelings for his goddess. With his growth complete, he no longer needs Aiz's growth status-- he loses it and gains a different status from his feelings for the goddess.
Thus the story is about his growth and then turns to his maturity and the strength of his relationship with Goddess.