A Theory

The phantoms are using memories, emotions, and desires to transform them into phantoms.

Aiden
-we probably know that he was suicidal at some point
-he almost died in the phantom world, but Ashlyn noticed something wrong with him (he woke up earlier unlike tyler, he was creepily smiling at ashlyn in the phantom world, and the font clearly tells us that something's wrong with him)
-it seems that he is somewhat turning more into a phantom but he doesn't know it since he was confused why ashlyn was shaking so much
-his situation seems to be a 50/50 (the insane side is him and the more insane is the phantom) so he's like half dead and half alive

Tyler
-he became the responsible brother ever since their father's death
-we know that he doesn't want to die and leave Tayler and his mom like his dad did
-he was severely injured in the phantom world, which put him in a coma (but it was short)

Aiden and Tyler
-we know that aiden is acting strange compared to tyler who went through worse (no pun intended)
-the fact that the two of them are going through a different situation after their near death experience is really weird

The Phantom Side Taking Control
-we see this happen (ep 43) with Logan when he tried to confront his bully
-ashlyn found it strange at first (cause logan wasn't that aggressive) but what's more strange is when the rest of tha gang started beating the bullies up and ashlyn can notice the presence of the phantoms around
-it's also evident that lights flicker when phantoms are around (in other eps too)
-there was also a scene where ashlyn screamed at a phantom to let her go, but the phantom understood her and actually let her go (ep 34)
-all of this simply implies that they are slowly turning into phantoms and this is what ashlyn realized when she saw aiden woke up (chap 61)

The Theory
-I believe that the phantoms are using their memories, emotions, and desires
-logan had enough of his bullies and the phantoms took advantage of the opportunity
-it seems that the others were also aggressive because they hated the bullies for what they did to logan
-it also explains why Aiden is so different from Tyler
-Tyler was always responsible and he didn't want to die so he was put to rest (as in coma)
-but aiden wanted to die so he was put in a 50/50 situation
-and this situation makes it so easy for him to transform into a phantom

More evidences
-we can actually see this happen with Taylor (ep 54) when the parents didn't believe them
-it just happen to be a perfect timing when the lights flickered and the parents saw a glimpse of the phantom world, this caused them to believe their children (the lights around taylor were already flickering when she was going through a rampage even before tyler woke up)
-another detail is when tyler woke up, the light was flickering and his heart monitor was beeping fast (idk if other forms of electricity are affected too or it's just the lights)

So basically it's like the phantoms are fulfilling wishes, right? Well, no. For me, it's more of a karma situation, you reap what you sow, or be careful what you wish for. It seems that the phantoms are using these memories, emotions, and desires to drive them more insane, aggressive, and uncontrollable just like phantoms.

What about you? What do you think?