Yeah, the Toa Mata are all super generic and bland. but she just happens to be the most generic and bland.
Like Tahu learned to put his ego and temper aside, and to be a better leader.
Kopaka warmed up to the other Toa and the idea of working together.
Lewa matured and learned to act more...mature I guess.
Pohatu..did not change much, I guess him and Kopaka became better friends? I dunno.
Onua also did not change much, but him and Pohatu were already pretty good for the situation they were in.
Gali also did not chnage much, somewhat like Pohatu or Onua, however I feel that she just needed something more. Compare her to someone like..I dunno, Katara from Avatar, Katara is a very similar to Gali, but is far more developed and unique.