Suzy and R.J. are the same person.Suzy created R.J. originally as an attempt to find out more about the Activity Club. She stayed with Johnny's gang because she can get a lot of dirt on other people this. My reasoning for this is that they have similar eye designs and can apparently take very good pictures with phone cameras.
PJ only died very recently.Recently enough to use up-to-date slang ("...then you screamed and totes fainted.") Maybe this is why Max's Dad got such a good deal on the Corner Store?
R.J. is some kind of supernatural creatureEspecially supernatural, considering normal humans can see him. I base this on his eyes, which are weird even for this comic.
Mr. Spender's glasses are his toolIn the scene right before Max bats the... well, the bat, we see a quick set of pictures showing the other characters preparing to step in- Mr. Spender is holding onto his sunglasses, with what may be energy swirling towards it or out of it. It would also explain why it is that he's always wearing them. Also, the current page header on the Paranatural website has all the tools together- Max's bat, Ed's brush, Isabel's book, and Mr. Spender's glasses on the top. Alternatively, his tool could be in one or both of his eyes, or be his eyes themselves.
Isaac is excluded because his power is extremely destructive or hard to control, and possibly tied to his emotionsI base this purely on the fact that when Max was pestering him in chapter 3, he used the famous Hulk quote "you wouldn't like me when I'm angry". There has got to be some significance there, not to mention he'd just finished explaining how he could "completely destroy" Ed and Isabel together. And Word of God has confirmed that Isaac has a rather sparky temper.
Doorman is a medium overtaken by the spirit possessing himAs theorized in this comment.
Issac has only been possessed recentlyIf mediums get more powerful as their spirit recovers and Issac can't really do too much with his powers, then it's only a matter of time.
Isabel's spirit is spider-like.Due to the symbol on her book, as pointed out by Crazyman BT in this comments section.
Johnny and Suzy are going to be the next two spectrals.In the most recent update a pencil tool happened to be found, the aura color is stated to be pink. Which matches up perfectly with Suzy's color scheme, and it being a pencil fits given that she's a reporter and has used one as a weapon before.On Johnny's case he has seen Issac fighting a spirit right after he was hit in the head, it's possible that he's starting to see stuff, and is shaking it off. He'd get the plunger as a tool, since it's connected to an enemy of Max who Johnny is a Friendly Enemy with. Also it seems predictable that he'd get a joke weapon.
Mr. Spender's eyes glowThe physical manifestation of his spirit is glowy eyes. His sunglasses are not his tool and are instead used hide his weird eyes from others.
Johnny has healing powers.C'mon. A scooter hit his head so hard it dented in, and he hit his head on a rock and definitely appeared to be bleeding to death, but jumped up moments later both times. And both times, the characters in the story noticed and thought it was strange that he was uninjured. Once is a funny event. Twice is foreshadowing. His healing power has consistent limitations, as well. Both times he appeared to have fatal injuries, he lay still, possibly unconscious, for several seconds to a minute, before claiming to have been fine all along, and laying still isn't really normal behavior for Johnny. So it presumably takes a minute to work.
Isaac and his spiritMontezeusma went to Mayview to meet Doorman for the same unknown reason as Forge but was defeated by Mr. Spender (Here the bunny spirit mentions a storm god on his list of arrogant dead). After the battle he possessed Isaac. When Isaac awoke his powers, he made a huge mess (This is why he was worried about Max awakening here and was what he tried to say here), and for this reason he is excluded in the Activity Club. This theory also explains how Isaac met Doorman, it was because Montezeusma already knew him and was working on the same secret agenda before being forced to possess Isaac.
Forge is Doorman's master.What is Doorman doing hiding in the outskirts of town anyway? We know they're affiliated in some way, but they're conspiring something. Likely with the intention of good but with questionable morality.
Mr. Spender's Tool contains the ghost of an Armstrong.And his sparkling techniques were passed down the family line for GENERATIONS!!!
Johnny actually receive brain damage from being hit by Max's scooterHis behaviour has become more erratic and less sane, even some of his (smarter) friends are noticing.
Max's dad has the potential to be a spectral, or is one in a minor continuity problem.This page got a lot of people guessing that Max's dad was a spectral because of the exchange about being a "weird psychic". While this was quickly written off as another joke, there might be more to the theory than some people realize: specifically, that the Whale-Frog initially tried to possesses him in Chapter 2 before reconsidering. Issac explains in the next chapter about the difference between tools and mediums, specifically that tools lure over a suitable spectral, and mediums are when the spirit possesses the suitable spectral directly. Why would Whale-Frog try to possess Max's dad unless he was, or has the potential to be, a spectral? The problem with the theory is the reveal of the barrier around Mayview; if Max's dad was already a spectral, he wouldn't have been able to get through the barrier without using the Ghost Train. It's still possible he's an unawakened spectral, however.