If I had any super hero figures, they'd exist in my 'verse, but as humans with exceptional skills, not mutated powers or anything like that. Punisher is Punisher as he would sort of fit with the Joes if he wasn't so blood thirsty for vengence.
He was oconsidered for the team when they first formed, but that was about the same time his family was killed, so they left him alone for a bit and when they went to recruit him again, they saw what he had become. All though they like his skills, the higher ups don't want a vigalante on the team.

Sorry Fireflyed, no black Ripcord for me either. My black Ripcord became Wreckage.

If I had the time and $$$, I'd make custom Star Wars figures that woud blend in. I can't recall who had the awesome Joe-verse style Fetts, but my guys would be like that. Otherwise, I don't have any SW figures in Joe-verse.

No Zombies or other horror movie monsters. No supernatural beings either.

No giant mutated experiments of Dr. Mindbender gone wrong or creatures from Destro's castle.

Pilots fly in my 'verse, not sailors and infantrymen. Tankers drive my tanks.

Pretty much anything that couldn't exist in real life isn't in my Joe-verse. About the only vehicle I've got that could never be is the Cobra Gunship. All the rest of my vehicles could be real.
Same with characters, no Croc Master or Raptor and especially not Crystal Ball. I don't have a lot of Cobra's named characters as they seem to have the more over the top personalities and bizarness.
Yes, I have Zartan, but I go with the idea that he's wearing a suit of micro hogram projectors that help him change his appearance and blend in with the back ground. That technology exists, barely.

My named Cobras are all mercs who would drop Cobra at the drop of the hat if the funds stop coming to their bank account. They have no loyalty to CC, only to his bank account. The troops on the other hand are made up of people who are in Cobra for different reasons; some are mercenaries, some are disgruntled former military from various nations, some are just plain criminals who couldn't get into an out fit tlike the Mafia or Hell's Angels, and others are guys who truley believe in CC's ideals. These are the guys who usually work their way up through the ranks the fastest.

Storm Shadow is a hard one. In the 'toon he was always a bad guy, but he spent almost his entire run in the comics as a Joe. I pretty much keep him a baddie, simply because that's how I know him and the only SS figure I've got has a Cobra symbol on his outfit.

The Crimson Twins have the usual connection that real twins seem to posess, but not the "you hit T and X feels the whole thing and gets knocked to the ground" thing.

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The United States will conquer Terrorism with the help of God and a few Marines.

Some people, when trying to avoid thinking about those things that cause them pain, turn to drink, or perhaps food, or drugs... I turn not to any of those... I collect action figures, turning my mind to the hunt, so that I might find a mote of peace... Over the years, I've found that alcoholism is much more socially acceptable by far.