I wonder if the Vacktor's exist in multiple universes it would explain Spooky Tales and things that don't add up 

Spooky Tales

Green, Red, and Barney are kids, and they go to the same school. Red and Green are also probably brothers in this universe and not Red's emotions. Eventually people started disappearing except for the three of them and the old man, so their parents, and most likely the rest of the Vacktor's probably disappeared as well, if they exist. (It's been awhile since I've seen Spooky Tales)

Vacktor House/episodes with any other Vacktor

The seven Vacktor's are siblings biologically. Red has called them his family, his brothers and they have called Red their sibling as well. They don't seem to be emotions in this they all feel other emotions as well and even get upset at the notion that they are Red or a part of Red. The Vacktor's don't even act as if they are emotions and Red doesn't seem to think of them that way. Purple isn't talked about because he turned evil and killed Magenta. Purple wants revenge on the Vacktor's and is slowly causing them to turn evil. Red is 21 years old so even if Magenta died a year ago people could still say she didn't live long. Red said he built the Vacktor house because they had so much energy, and that he bought out the whole neighborhood. The Vacktor's do have parents in this universe as Blue mentioned his mom giving him and apple for school, and Yellow mentioned being a kid a few times he thought it was weird that Barney didn't celebrate his birthday. Sky and Barney haven't really met any of the Vacktor's besides Red at the beginning. We also even see Blue in real life. Yellow has super powers which aren't explained very well which he received when he was struck by the sun and has become something other than human. Red couldn't have made the Vacktor's in this universe he even said he wasn't a scientist :/

Roommates

The Vacktor's are Red's emotions. Red was trying to become emotionless. They aren't his family Red even stated this, but at the end he says they're a part of him. Purple and Magenta were never a part of the family in this universe. The Vacktor's aren't kids here as they were able to apply for adult jobs. Despite the fact that they're his emotions Red is able to feel other emotions. Sky and Barney have met all the Vacktor's.

Red commented on X Vacktor and said the story was told, yet left so many questions and things that didn't add up. The only reasonable explanation I can think of is that they are all different universes.

In fact in Spooky Tales Red mentioned that they might be a black hole to another universe and in Roommates we've seen other universes and other versions of Ross who are slightly different.

Yellow has trouble processing other emotions

When Yellow accidentally killed the chicken egg he had a momentary freak out that seemed a bit odd, it be that he's going crazy, but I think it may have to do with him having trouble expressing his emotions. He also did something similar to this in Slow Fast around 6:09 into the video. Yellow did say smiles were his energy and that he had no choice but to smile.

If this did take place in the Roommates dimension this could make a lot of sense, because Red told Yellow he was happiness so maybe Yellow only believes he can be happy.

If Yellow is or became a robot this could be because he's programmed or he's having a glitch

Yellow talked about how the Vacktor's were endless and that he didn't know many Vacktor's existed and Red once wanted to have a family reunion. This doesn't make sense all five living Vacktor's live in the Vacktor house he sees them practically every day.

I see some similarities between Yellow and Spongebob. Green and Squidward and sometimes Barney says weird and random stuff like Patrick.

In fact in one scene Spongebob is filling out a resume and wonders what a felony is and Squidward tells him it's being happy all the time and I can easily picture Yellow and Green in this one.

Yellow: -filling out a resume- Have you ever been convicted of a felony? Hmm, what's a felony?

Green: Being too darn happy all the time.

Yellow: Oh yeah! Lots and lots of felonies. 

Why am I so obsessed with a bunch of colors? Who ever thought they'd be this interested in a story about a bunch of colors? I even had a dream where Pink was kidnapped by Purple, and another dream where Green, Blue, and Yellow needed Red to recuse them from inside cages. 

Whenever I like something I keep coming up with theories about it.