There is another guy who keeps coming back and often bugs people on msn. One of his aliases is warrior of destiny. He usually logs in with "fanatic" in his username somewhere but never posts. I only mention this because I had him try to bug me on msn again (I just blocked him before he had the chance) but he may be bugging other people.
Warriorofdestiny was banned in November of last year, and myself and the other admins have been keeping an eye out for IPs in the range of him and the other Gytrain identities. I've gotten to ban at least a couple of those identities myself.
If he messages you on AIM or MSN: Block him. He's nothing but a leech.
As for Link/Samus/Master Shake/Serra/Roy/Marth/Eliwood/whoever-the-heck-we-just-banned...all of us had been spending a while watching their every move before daring to touch the ban button. Unfortunately, we cannot do a wide IP-range ban on them because several other members live in their area, including Vincent Valentine, Green Goblin, and other old posters that we'd never want to lock out.
About the 'random' coincidence of one of the newly banned members ending up in Wifi- I put them there on purpose, so that Toan and Meep, as well as this weeks "Dorm Chaos" members of Nycounterpoint and Selena, could all watch them and report anything suspicious. We've been...very careful.