Theory on how Jiji's character will develop this arc

Tl;dr: Jiji's character has been shown to mix his need to protect Momo with an increasingly rash and possessive approach, and I think this will result in two major things: 1. Jiji endangering the gang by doing something rash that he thinks will protect Momo 2. Jiji being rejected by Momo, which will allow his character to develop outside of her

One thing that has been highlighted this arc is how impulsive and possessive Jiji is with regards to Momo.

Firstly, after the Danmanra arc, one thing that Tatsu highlights well, but subtly, is how Jiji's good hearted nature can also mix with feelings of jealousy and possessiveness when it comes to Momo. This is the case when he says "you'll ask ME to join you", when instead a much better choice of word would be "you'll ask US to join you", despite the fact that the best way to protect Momo is as a group.

Secondly, we see very clearly that Jiji's aggressiveness against Zuma is an extreme overreaction, given that even Aira (who definitely cares for Momo just as much as Jiji) is able to keep calm headed by telling Jiji to stop before attacking Zuma. The only reason she later joins us to support Jiji, since it's too late to talk everyone out of this.

The 3rd and 4th image should also highlight how, despite Jiji coming from a place of good intent, he nonetheless uses very possessive language towards Momo, as seen by "she doesn't BELONG to you" and "precious TO ME". Language matters a lot, and Tatsu uses this very well to convey his characters' feelings subtly.

So what does this mean for his character this arc? Put simply, I think Jiji will take increasingly more rash decisions when it comes to Momo, until it gets to a point where his action ends up outright endangering someone else in the group. This chapter it was Zuma, but I can see Okarun being unintentionally endangered by Jiji in the future by doing something he thinks will protect Momo. This will then lead us to Jiji finally admitting his feelings for Momo, resulting in his rejection and allowing him to grow as a character.