As a writer, I don't think I'll see eye to eye with anyone using an anime character's name (or any pop cultural reference, really) for their own... but I also recognize it's just a game and people will do whatever they feel like doing. I imagine there's a lot of people who have little to no attachment to their character and just wanted to jump in and play, so they used the random name generator, or thought something along the lines of "I like X person from Y anime/manga/video game, so I'll use their name!"

That aside, I know a couple who played as Shiro and Sora Veda, and they lead the Blank FC. I'm kinda glad that they're not around anymore because they always remind me how badly I want a second season of NGNL.