A sidequest?
You could call it that, but it's also integral to the story.
It's a bit early for hints, but you're thinking along the right track.
"Sometimes easy, sometimes hard,
Always changing, never marred."
This makes me think that the answer is a game, perhaps a side-quest?
神話―月
Shinwa-Tsuki
Myth-Moon
Need a name for your character, ability, item, or location. I might be able to help, see this entry for more information .
Gamblet's got it, Triple Triad.
Ten in total, nine are marked. - Ten cards are chosen in total, while only nine are "marked" on the grid, or played.
One man helps to get a start. - There is a guy who gives you a starter deck in Balamb Garden.
Sometimes easy, sometimes hard, - Obvious, some games are easier than others.
Always changing, never marred. - The rules are changing all the time when you get far enough into the game, but it's still recognizable as Triple Triad.
Reflections on reality, - Jack, Queen, King, Joker, Spade, Heart, Club, Diamond exist with real cards, and...
Positions of dignity. - All of the above are high ranking TT players of the world.
For best results, go early. - Meaning early in the game.
It will be worth it, surely. - Obvious.
Here we go:
Riding on my trusty steed,
you make me feel like I'm the best.
Obsessed by you,
I vow to protect.
I am your lapdog,
as I have dreamt all along.
Seifer's point of view, speaking about Edea possessed by Ultemica. How far am I from the answer?
神話―月
Shinwa-Tsuki
Myth-Moon
Need a name for your character, ability, item, or location. I might be able to help, see this entry for more information .
Is it Seifer, the Knight?
Right you are.
"Riding on my trusty steed,"
A knight.
"you make me feel like I'm the best."
Seifer felt like a demigod when he was guarding Edea.
"Obsessed by you,
I vow to protect."
Self explanatory..
"I am your lapdog,"
Reference to the line Squall said to Seifer
"as I have dreamt all along."
It was Seifer's dream to become the Sorceress' Knight.
Your turn, Miss Lockharted.
Two not Eight
Will start the link
A scaled hide
Will make it clink
It shines in June
That is the key
The colour is like a Ruby
Beware for it will sting
A venomous jab
This is more than a fling
Nope.
The last line is just filler to make it rhyme, it's not relevant to the riddle, btw.