What are the Creatures?

Question

You look all around as the darkness has cleared
And now in your presence you see something weird
Two creatures before you, oh what a strange sight
One man is burning and shines brilliant light
Next to him another you finally see
A woman who melted, though glad as can be

The pair may look odd, but they get along well
Though if they were to mix, it'd be all except swell
In spite of their state they will still move around
You may even catch one jump off of the ground
They have other things which to do they sure ought
Sometimes they work gracefully, other times not

As working together they finish their task
They walk to the exits, then leave in a flash
You watch them both go as they're finally done
You step back and realize you had some good fun
Lasers and fairies and boxes galore
You think you'll come back, well, at least five times more.

Now that I've told this unique tale to you
What are these creatures, and what did you do?

Hint 1:

You think of the day when the two you did find
And realize it must have been 2009

Hint 2:

You wonder why any adventure so wild
Should happen to you, who are likely a child

Hint 3:

If you want to have that adventure today
Log on a computer, and merely hit play.

Answer 1

This seems to be:

The "Fireboy and Watergirl" series of online flash games.

You look all around as the darkness has cleared
And now in your presence you see something weird
Two creatures before you, oh what a strange sight
One man is burning and shines brilliant light
Next to him another you finally see
A woman who melted, though glad as can be

The eponymous characters are a male fire elemental (burning and shining), and a female water elemental (who has "melted")

The pair may look odd, but they get along well
Though if they were to mix, it'd be all except swell
In spite of their state they will still move around
You may even catch one jump off of the ground
They have other things which to do they sure ought
Sometimes they work gracefully, other times not

Fire and water shouldn't mix, the characters can move and jump, and should work together to solve the puzzles (though how graceful that is is down to the player!)

As working together they finish their task
They walk to the exits, then leave in a flash
You watch them both go as they're finally done
You step back and realize you had some good fun
Lasers and fairies and boxes galore
You think you'll come back, well, at least five times more.

Again, they work together to solve the puzzles needed to get to the exit of each level. Lasers and boxes feature prominently in the puzzles. I'm not familiar with the later games, but number 6 is subtitled 'Fairy Tales', so I imagine fairies might play a part. There are a total of 6 games in the series at the moment.