@Archangel89; I'm sorry that it took me so long to get back to you, time zones and everything, I was actually asleep, heh. As for your question, you bring up a really good one. Usually, as long as the character works, and is able to fit into the roleplay and the way that it's run, then I don't see an issue with it; there are just some characters, as I mentioned earlier in the OOC that just don't work. And until now, no one has actually brought the Marvel or Star Wars universe to my attention.
I know for a fact (thanks to an old roleplay I used be in) that a good chunk of the Marvel universe can actually fit into a roleplay like this one; even with it being centered around a mostly medieval time. Of course, they will need to be modified to fit, and a lot of them (Thor, Loki, Dr. Strange, Enchantress, Xavier, etc.) will need to be toned down in order to work, but I have no issues with introducing them into the roleplay; for example, you could take Logan and have him cursed into a werewolf or beast of some kind... Widow could be made into an assassin for the Dark Queen... Hawkeye could be an archer in one of the Royal armies... The possibilities are endless. There are characters, however, that you would need to convince me on though, just fair warning; characters like Tony Stark, Wade Wilson, Ant Man, etc.
As for the Star Wars universe... if you give me a bit of time; I might actually be able to introduce that universe to the one we already have later on as an arch- possibly with a villain or two from it. I don't know much about this universe apart from the original three movies- I watched the prequels and... well, honestly, I kind of lost my interest in them... sad, I know... but I have a friend who is VERY into them that can help me with this, and I'm sure that any Star Wars fans already in this roleplay can help me out as well. If we can introduce the Narnia universe here... we can sure as hell try with the Star Wars one..!