There is one problem with the character though. He hates anything to do with war or weapons so his teaming up with Koko and her group doesn't make a lot of sense but, it isn't really touched on and, when it is, Koko is involved so it leads to some interesting moments at least, given that she is an arms dealer. Still, Takahashi never really addresses the problem so it flaw, but a minor one. This also isn't really a problem since Jonah is often teamed up with Koko, who has more than enough personality to spare, so his lack of personality and contradictions are covered up, as it were.
In fact, Koko to tends to steal the scenes that she's in but that's a good thing since she is pretty much the driving force behind the comic. This works well since, while she isn't the most complex or deepest character out there, there is something to her. She is also helped out by her personality quirks, which tend to be on the absurd side but it works well with the tone of the series.
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