These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Alternate Character Interpretation: Redlight. He works for the Slender Man and removes the memories of two of the most influential bloggers. On the other hand, he doesn't recruit them for Slendy, either, and they both seem fairly happy in their new lives. Is he tearing the community apart on the Slender Man's orders, or fighting against Him by freeing people from His influence?
In light of more recent events, the more favorable interpretation of Redlight is starting to fall from favour, though.
And for Robert himself. at what point, if ever, did he begin to go insane?
Mary Sue: Was accused of lying to elevate himself to this level in the eyes of the slenderbloggers by redlight. Others theorize that redlight even bothering to try to discredit him while flaunting how powerful Slender Man is and telling the bloggers that "they need to kow their place" means either Robert was onto something or that it was a Gambit on Robert's part to try to weaken Slender Man by instilling optimism in the bloggers but was then Out-Gambitted by Slenderman and redlight.
In addition, the tendency for bloggers following Robert's Core Theory to give themselves special titles and superpowers led to a large amount of backlash and caused many bloggers to abandon the title system.
Tear Jerker: Robert's ultimate fate. He was captured, tortured, and had amnesia forcefully induced by someone named redlight, who then took over Robert's blog and taunted the slenderbloggers in an attempt to break them.
Redlight in midst of flaunting his victory also had the nerve to bring out an offer he thought the bloggers couldn't refuse, but was rebuked en masse with only Nessa being a willing exception. Even then though, it was only after she was captured, brain-washed, killed, and resurrected.
See the Shaggy Dog Story entry.
The Woobie: Robert once stood firm as a figure of strength, logic, and hope alongside Nessa for the slendercommunity in the fight against Slender Man. Since then he's been strategically broken, humiliated, and then rendered amnesiac before the whole thing started all over when became rehaunted while protecting some children from slim.