Windy the Fairy has crash landed in Peggle 2 as the newest master, and she also happens to be a $2 piece of DLC. It's not just a character pack though, as you'll net 10 new story levels (which can be used in multiplayer), 10 trials, more achievements, and extra costumes.
Windy is a no-nonsense character -- in other words, there's no cryptic Big Lewbowski homages here -- she's just a cute fairy who loves the color purple. This is reflected in her power, which allows you turn other pegs into purple bonuses right after you hit a green power peg. As any Peggle fan knows this power is pretty huge, as it's not situational -- it's good for every situation.
Peggle is such a lighthearted game that calling her "overpowered" would be a stretch, but the fact that she morphs four pegs per use of her power (and the screen freezes for a second to allow you to hit them that round), and that they don't go away is major.
Her levels (which take place in an area called Hallelujah Hollow) aren't anything to write home about, but they offer up the ability to score pretty huge bonuses with lots of slides, which will rack up major points when coupled with her power. In other words, don't expect anything challenging here if you're yearning for something more.
I already thought Peggle 2 was absolutely worth the price of entry, but there was a lack of characters that hurt the prospect of long term play. As long as PopCap can facilitate the release of characters as fun (and cheap, pricewise) as Windy, I don't think we have anything to worry about.