What happened to the Ike boards... have you people gotten *dare I say?*... LIVES?!?
Ah Hell, I can't be annoyed, anyway for Halberd...
The stage itself, has some crazy stuff going on.
First fifteen seconds of the fight, I don't know how this will be possible (at least not with Ike, and not without having to take himself out with his opponent either, or some crazy luck, or some stupid opponent, or *shot*), but you can get the opponent to stay off of the platform that is to take off, and they are going to instantly DIE!
Once that part is out of the way, you're on this platform, with an even smaller platform floating in the middle. This part has room to work with from the bottom-up, and a little bit less room on the side blastzones, so I'm sure that even for MK, getting back from the bottom will be an enormous feat to accomplish. Then you have the infamously-low ceiling blastzone, so perhaps people like Weegee who are fantastic vertical killers are not suggested to be brought to Halberd, but if not that, Ike can benefit from that quite well with characters Like Kirby or Mr. G&W. The platform is like Delfino Plaza on take-off where you can just aim for the ledge without any worry of missing it. This can be a problem however, when again, a character like MK can just hang under there and start spamming Uairs.
After that's out of the way, you now have the third stage of the Halberd... the ship itself.
The blastzone on the side here APPEARS to be closer, but in actuality isn't. It's only closer just because the main platform is bigger, so now characters with a nice gimping game are free to just hit you once and be able to return safely wheras an attempt on the 2nd stage might've failed. It's not too bad though, if you manage to score a hit of the ledge, they'll be dying soon too! Take note of the ledges, they act in the same sense as the lips on Final Destination, so better practice those Aethers. And now you have the hazards, with the combo cannon and the bomb thingy, and the claw, all of which can be used to your benefit if you do it right. The Claw, if aiming at you, can make you automatically trigger a Counter, the bomb can kill people (as well as set off a Counter), and the Combo Cannon can keep people stuck trying to SDI out of it, and perhaps right into one of your good Aerials or a Smash attack.
Once that is all out of the way, stages 2-3 repeat.
That's all I can come up with, with certain characters Ike is neutral in terms of reaping benefits, whereas with others he gets more of it.