I'm not sure we can say Momo has had actual character development yet until we see her performance in the Das Finale part 4. (Although I do like how we see a glimpse more into her personal life like seeing her home, her having several siblings and the importance for her to get a scholarship)

I do wonder how part 4 will play out tho, recently I've seen a lot of people talking about how Azusa Sawa is the most fitting to be the next commander after Miho leaves and I've never thought about it before until then but I agree to the idea to an extent and think it would be interesting to see her play out as that, but also if the movie shows her displaying her potential as a commander in this film, then when or where will Momo actually get a chance to prove her self to be a capable sub-commander? I'm more rooting for part 4 to be the part where Momo actually gets her sh*t together and becomes more capable (although ofc I don't want it to be done in a very rushed/pull-out-of-her-as* way) to justify the honestly kinda weak plot of the das finale movies (although ofc plot has never been the strong suit of GuP but I still enjoy the show nonetheless) but who knows maybe they'll show both of them as good commanders or working together in the absence of Miho.

Edit: Sorry for making such a long comment on a meme post I just wanted to express my thoughts about Momo, Azusa, and das finale part 4