More FF9 Riddles

So, are they represented as the set of mirrors, the set of shrines, and the set of shrine bosses, which would be the only part truly dangerous?

Yep.

Edit: Here is the expanded riddle reposted:
We am represented three ways,
You might find us dangerous,
We won't lie — only one set is truly danger.
What are we?

There are four of us,
At least three ways are we linked.
Another way we could be represented,
Is spherical in nature.

Edit 2: ChocoBoy, can you think of what the final answer is (and the reason why I think it is a bit of an abstract answer)?

The elements, Air, Fire, Earth, Water.

Yep, that's the final answer.

Here's the break down:

We am represented three ways,
This refers to the four Shrines, the four Mirrors, and the four "Crystal Bosses".
You might find us dangerous,
There are really two interpretations of this line: 1. The Bosses are the dangerous ones, and 2. The fact that each of the four elements are dangerous in and of themselves — Volcanic eruptions, Tsunami waves, Earthquakes, and Tornadoes. It is the second interpretation that is meant here.
We won't lie — only one set is truly danger.
Each of the four Shrine bosses is dangerous.
What are we?
The four classical elements.

There are four of us,
Should be obvious. There are four classical elements.
At least three ways are we linked.
By this, I am referring to how their linked in the game itself.
Another way we could be represented,
Is spherical in nature.
The spherical version of this four representation are the four colored Stones (Red, Blue, Yellow, and Green — each of which are a symbolic color of Fire, Water, Air, and Earth receptively (although, in some cultures the Earth and Air have their symbolic colors switched)). These Stones, I see as being spherical in nature.

A bit of a throwback,
you might remember me.
You didn't for get to stay in your line?
What about the spin at the end?

Free them from prison,
and you can find me.
Two steps forward, three steps back.

What am I?

Well, I know it has to do with the Rufus Parade song playing on the Prima Vista...

So the boss flower plant thing?

Yeah it's gotta be related to Plant Cage or w/e it's stupid name is.

I do have to agree that the answer is musical in nature, I personally think the answer might be with the saxophone (or what ever it is called) in the Black Mage Village that will play a certain theme if you have three Key Items the names of which I do not recall.

Sorry, I've been gone for a couple days. But I've got to give it to Tifa's Boobs. It's the Rufus Parade song, in general, but since she mentioned it, I'm giving it up.

A bit of a throwback,
you might remember me.

-It was in Final Fantasy VII.

You didn't for get to stay in your line?
What about the spin at the end?

-Has to do with the marching in Junon in FFVII, which you do to this song.

Free them from prison,

-Vivi and Garnet from Prison Cage.

and you can find me.
Two steps forward, three steps back.

-References the fact that it you go to steps(screens) forward from the crash site, you get the ATE to start the song, then if you go three steps(screens) back, you can see them actually playing it.

Tifa's Boobs, you're up.

Kisses and Hugs
I don't like it rough!
Gotta go deep
Golden Showers
Happy Explosions

Ragtime Mouse. :D

Yuh! :D

W2g Rantz yr turn bby

Oh Sam, you're becoming a parody of yourself xD.

Two gross people is all I can bear
Though my end was by just one
And one is all that holds me, but
You ain't seen nothing 'til you've seen me!

Black Waltzes?