More FF9 Riddles

Thanks Gamblet! You better give us a riddle before you start playing FFXIII-2, FFIX Choco Boy. If you leave us in the lurch... :argh:

Keep your panties on Jiro.

From the beginning, straight to the end,
I'll be useful, you'll depend
On me for your survival,
to help you beat your rival.
But unless you verse a single,
I don't change for your tingle
To learn all you can learn,
But trust me, you're not who I spurn.

What am I?

My guess is some sort of weapon, likely a [thief's] Dagger.

gil?

Neither.

I'm guessing its's the summons (all of them, not one in specific, so if it is a specific on just say no, I want to figure it out)

My original thought is Trance despite it not really fitting most of the lines!

AP?

Depression Moon has it, AP!

From the beginning, straight to the end, - monsters in all parts give AP
I'll be useful, you'll depend
On me for your survival, - you need AP to learn better healing skills
to help you beat your rival. - and better damage skills
But unless you verse a single, - A "single" refers to a boss, which you only verse a single time
I don't change for your tingle - most mobs give just 1 AP, while bosses give more typically
To learn all you can learn,
But trust me, you're not who I spurn. - It rhymed.

You're up, DM!

Makes perfect sense now that I know the answer :monster:

Cool I got it.
I'll be back with one in a few.

Death brought you here
On the way you found more of it
I thought you were the cause of it
Do not confuse me with him
I'm a real warrior
But him and I are not totally different
We have one thing in common
We both saw death

I hope this one isn't as hard as the last one.

Looking for "I", "him", or "we"?

If you want we, then I'll guess the obvious: Zidane and Kuja.

I'm going to guess Vivi and Black Waltz(es?).

Neither.

To Choco Boy you're looking for I, but him or I will give you the right answer.