Yokkiey

http://www.heroesandvillains.info/forumv3/index.php?action=profile;area=showposts;u=8564

http://www.heroesandvillains.info/forumv3/index.php?action=profile;area=showposts;u=8567

And another - Petikaka

Only one post but looks a bit spammy

http://www.heroesandvillains.info/forumv3/index.php?action=profile;u=8592

Has Zesagiji already been dealt with ?

Both gone.

We've got another one who has helpfully started a new GTC Division 4 thread from 2012.

Brill thanks PWS.

I'm completely at a loss as to what these posters/posts are meant to achieve.

Would a capcha thingy on sign-up stop them or are they real people?

I presume they are real people, as well as Captcha on sign up they have to answer two questions as well, this also applies to their first three posts.

As to what they are trying to achieve, email addresses would be my guess.