User blog comment:AtlasFlame206/What new character(s) you imagined to be part in Fairy Tail?!/@comment-4829046-20130806114943

Shouldn't it be the other way around? Why do those have to be part of FT and not FT being a part of them? They can't exist together except in a altered space where all their realities can come together without causing chaos. =P

Anyways No. Just no. The creator of SAO/Accel World did a crossover battle between Kirito and Silver Crow and it didn't make any sense despite them being set in the same universe. If that didn't make sense then this certainly can't. And another thing

Gandalf - True Wizard. The definition of Wizard.

Harry Potter - Bunch of wannabes that can't do shit without their wands(well they can but its almost like they didn't at all) FT-verse mages would beat them to a pulp

Percy Jackson - I don't think Percy Jackson Greek Mythology should ever mix with any other one, especially not FT Greek Mythology.

Monster Hunter - The MonHun world is full of gigantic creatures that you can kill and make into weapons and armour so I suppose that could work. Especially if we are talking about Mashima's Monster Hunter Orage manga. But having those guys in FT never stroke me.

SAO - It is a VRMMO not magical or anything, its just digital data.

Anyways as answer to your question. My own characters. You see, the stories I'm writing do a lot of crossovers/references with other series so I add my own characters into FT but without disrupting the events. Actually my username was originally intended for one of those crossover characters.

I don't think a crossover should ever happen without inter-dimensional travel and if they do, I want the residents of another verse to be bound by the same laws as the verse they visited. Similar to Edolas where Earthland Mages must take that drug to be able to use magic.