Eliminators...If there is a normal encounter enemy more powerful than this guy, I don't want to meet him.
First time I saw one, I just said "screw this" and headed to the portal. Didn't try to fight him (Didn't even see what he could do, other than warp). Second time I saw him, I decided I'd try and kick his ass (I had so much confidence in my Thundara command)...You can guess how that worked out. By now, I've beaten about 4 of them, and learned a few things.
Unlike most "armored" Heartless, he is immune to Heavy Blade. No joke, I had Zero/One at MAX Overclock (Heavy Blade and Targeting Scope at 3 and 4 respectively), took a swing, figuring this honky mahfah would be much easier since I could go through his guard at a distance. BAM! Nothing. Just the sound that happens when you're deflected. I thought "WTF?" for a quick second, but just used the get-behind-him trick and ended up beating him anyway.
He's a Spam Artist in the making. As he gets low on HP, he likes to spam the status orbs every time you block them. If you can bait him into shield biting you instead of the Status Orb, you'll be better off.
He's kinda slow to turn. If you can bait him into using the Shield Bite and dodge roll behind him, you can get off a few good hits before he makes his way around. Targeting Scope makes this a little easier, as you don't have to get so close.
Hope that Helps everyone. I tell you, Eliminators are just how the Journal describes them-A Nightmare.