Because, in the greater universe among civilized spacefaring planets, it is known what the Reach does to worlds. It's known that they go to developing planets who have yet to discover their place in the cosmos, and they fuck shit up. One of the Guardians had a personal connection to this, and when it was discovered that some backwater world had been targeted by the Reach years ago, they decided to act.
That's just one justification off the top of my head. If you want to write the Guardians, and you want to base them on Earth in this setting, it wouldn't be difficult to weave them into the narrative.
The problem is, though, that I think you'll find it to be difficult to maintain the Guardians as part of the narrative for long. The conceit of this game means you'd have to have them stick around on Earth, which severely undercuts the entire point of the Guardians of the Galaxy. It's not just about having a character concept that can be woven into the narrative, but having a character concept that has a reason to still exist within the narrative.
My two cents again.
Thanks for the two cents, man! Actually, that’s what I thought, too. Let’s say that the current narrative makes sense for the Guardians to enter, but surely, the storyline has to move forward and it can’t just stick with the same conflict over and over, right? Which is why, although I understand Drax more than Deathstroke, I find it difficult to not just introduce him, but also writing him in the long term. Wish there was a comic book group RP that balanced between Earth and space, but, oh, well... I’m yet to find one anywhere else.
That said, I’ve actually made up my mind. I might be working on a Deathstroke CS after Wednesday. I still have one more thread I gotta attend to this week. I’ll let you guys know the progress once I start cooking it. Tho, say, if my CS is rejected under any circumstances, can I still reapply in the future?