Shakugan No Shana, Full Metal Panic[sort of], Elemental Gelade, Fate/Stay Night...
that's all i could think of right now.
But I'm also looking for other animes lol.
i just finished watching Kaze No Stigma today. :)
EDIT:
Hmm, if you liked Kaze No Stigma, you might like:
Zero No Tsukaima
Shakugan No Shana-Ria likes this
Buso Renkin
Sugar Sugar Rune
Kampfer
Romeo x Juliet-Ria likes this
Ayashi No Ceres
DN Angel
Kyoshiro To Towa Na Sora
Rosario + Vampire
I can guarantee you that much :)
Zero no Tsukaima and Shakugan no Shana are practically the same though...
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Kaze No Stigma and Elemental Gelade. Both animes have Elemental powers just like Tokyo Underground.
Yahoo Groups (See related link below.) , AniDb , Anime News Network , OtakuCenter , Anime-Forums , Anime Planet , CrunchyRoll , et.al. They will all have forums where you can meet like-minded people who admire anime .
It is really hard to find similar anime's to other anime's I've looked that up many times and yet still no answer.
What's the color of the protagonist's hair? What do the other characters look like? What is the theme of the anime?
What ever anime you like