"If Nami had anything to do with Summer's disappearance Nika would have never forgiven her."
If he knew, or found out, maybe. The Ruby Goddess is pretty smart and sneaky. Nami is the best girl, she can get away with anything if she puts her mind to it.
The Nami-haters are just jealous because their girls aren't as good
I have other theory, if i remember good Nika can´t remember a time in his past, maybe he did something to her and that´s why she left?? This would explain the trauma (he can´t remember what he did but the trauma is still there). I prefer the theory of a darker Nami but this can be possible right?
While being an interesting theory, what some of the "Nami did it" proposer seem to forget is the status of Nika when found back in the day. We have the hospital flashback, which cannot be from a simple school fight or so, due to the severity of his wounds. That would have made rounds, if it were from school or something. We can be rather sure the flashback is from the day Summer went missing.I read few comments, it seams nobody believe that a beautiful Ruby Goddess Cheeto can have dark thoughts or do anything wrong to Summer... Even if Summer's gone...
Nika came into the hospital with two collapsed lungs and what seemed to be defensive wounds. That was an assault with no regards if Nika makes it. I truly doubt even a "dark Nami" teenager could do this to her friend and the brother she adores and loves. Hiding Summer´s body so well she is never found and keeping the act up with Nika for years.
For that she would have to be a total psychopath, for which we have no evidence and even then it is a stretch. Nami is many things but that is not the Nami we know so far.