Here's one of my OC's Personality tell me what you think after reading it.
Takehiko is a kind, modest and level–head person with a strong sense of morals. He is also serious, highly clever and is very caring towards his comrades and their safety. He is also shown to have an unbreakable will during extreme turmoil such as the death of his parents who were killed in front of him. Despite rarely losing his temper, he can feel tremendous anger towards those who take joy in taking innocent lives and towards those who disrespect his friends and comrades or those who have fallen. He is also shown to be a great leader in battle.
Takehiko showed remorse when he kills his enemies never taking joy when he took their lives but will kill them without mercy and isn’t incapable of feeling guilty afterwards. Despite not being concern for his enemies well beings, he respects them on a warrior basis. He can also show signs of compassion and sympathy towards those who showed remorse such as Crank Zent.
After the death of Biscuit, he developed a hateful side of war. He vows to keep on fighting for survival. He is determined to protect those he cares for such as Kudelia and protecting Tekkadan’s dreams.
Takehiko has been known to be respected by his enemies for his pilot skills and as a great fighter.
What was the statement on Kekistan about? I didn't find any such statement on the Martian Republic or the New Roman Empire. Your statement seemed a bit odd for the Gundam Fanon Wiki, where being fictional should be a given. The words you chose made it seem like there was a problem you wanted to convey. If that was your intention, could you explain what the problem is?
The idea of Martian or resurgent Earth organisations or governments is a well-established story device, Kekistan on the other hand is based off a meme and comes across more as a joke. At the time I wasn’t sure if you knew that and had taken it as an actual country that did exist.
There is no problem so to speak, it was more along the lines of uncertainty of your train of thought.
Do you think its possible for entire EFF units to defect to the various Zeon movements? If so, what would you consider the greatest possible size (teams, regiments, divisions, etc.), and which UC conflict would this be the most probable (OYW, gryps conflict, Laplace conflict, etc.)?
Probably during Gryps (UC 87 to 88), seeing how the Titans (later the New Desides):
"turned rogue, allying themselves with Axis Zeon"
―Titans page on Gundam Wiki
While I can't say I know of many turncoats within the UC timeline, most that I could find seemed to be from Zeon to the EFF, and those that turned from the EFF to Zeon were deep cover spies (and Nina Purpleton). So there aren't many examples of traitors within the EFF to work from. It's also somewhat tricky to justify, I can't imagine many people from Earth would sympathise with Zeon following UC 83 after the colony drop.
I suggest getting Mikel's opinion on this as well, but your best odds are that most people would have changed sides during Gryps after seeing the Titans do it. While they were allegedly destroyed by the colony laser, enough survived to found the New Desides. Additionally some EFF personnel could have seen the Titan's actions and been so blindly obsessed that they considered the same, despite the Titan's infamous reputation. The biggest question is how many people would have jumped sides together, and at most I think you could probably say a mobile suit squad/team max. You could say more if the Titans had merged with Zeon, but I don't know if that ever happened.
In my opinion the UC is pretty fixed with who plays on which team (with some minor movement, like AEUG and Karaba personnel joining Londo Bell, which is part of the EFF), unlike say in the Cosmic Era where soldiers from ZAFT, ORB and OMNI were known to have abandoned their post joined someone else (granted, changing teams from OMNI to ZAFT was probably unheard of, which is similar to EFF to Zeon).
Apparently, not very much happened until after the One Year War:
"The red planet is mentioned in the manga Mobile Suit Gundam F90, where it is revealed that the planet became home to some refugees from the Principality of Zeon after its defeat in the One Year War. These refugees, known as Mars Zeon, settled at the volcanic mountain Olympus Mons, where they established a base to repair their ships and Mobile Suits. In UC 111 it became known, that these Mars Zeon (also called Oldsmobile Army due to their use of outdated mobile suits) had converted Olympus Mons into a giant cannon which they planned to use to attack Earth. As a result the so-called Mars Autonomous Squadron was sent there to defeat the Mars Zeon, a task which they were able to complete."
Mars wasn't of interest until late UC, so I doubt anything of interest happened there during the OYW seeing how it's undeveloped and far away. The Feddies would probably not have bothered to deploy to Mars because the cost far outweighed the reward at the time.