wuts ur fantasy fight?
my top 5 would probably:
1.Kenshin vs demon eyes kyo
2.Hiei vs Gaara
3.Goku vs Yusuke Urameshi
4.Roronoa Zoro vs Trunks
5.Big O vs Burning Gundam

wow wut big matches!!!!!!!
sssoooooooo kewllll dude!!!!!!
wonder who would win?
hhhmmm

You know these would just be kickass battles...bolded ones are my prediction on who'd win the fantasy battle:

1. Uchiha Sasuke (Naruto) VS Roy Mustang (Full Metal Alchemist)

2. Kurosaki Ichigo (Bleach) VS Mugen (Samurai Champloo)

3. Jo, Meg, Sei, and Amy w/ Jango (Bakuretsu Tenshi) VS Sagara Sousuke, Kurtz Weber, and Mellisa Mao w/ their AS Mithrils (Full Metal Panic).

4. Harry McDowell's Millenion Executives (Balladbird Lee, Bob Poundmax, Bear Walken, and Kugashira Bunji) (Gungrave) VS Aion's Sinners (Rizel, Shader, Viede, Relajie, and Genai) (Chrno Crusade)

5. Vash the Stampede (Trigun) VS Beyond the Grave (Gungrave)

6. Niwa Daisuke --> Dark Mousey (D.N.Angel) VS Yoh Asakura --> Amidamaru (Shaman King)

kakashi vs guy
recca vs sasuke
gaara vs kenshin
Hiei vs gaara

that's all i can think of

robots from FLCL vs. robots from Dual

.. i know.. i'm not that creative ^^

Hiei vs. Itachi
Vash the Stampede vs Spike

who is HIEI? what anime is he from

3 eyed Demon from Yu Yu Hakusho.

The girl from appleseed vs trigun.

gaara vs hiei? gaara would winnnnnnn

anyways...
kenshin vs. jin
shessomaru (inuyasha) vs. itachi
mustang vs. sasuke
gaara vs. orichimaru (i forgot how to spell his name)
mugen vs. kenshin

MUGEN VS SPIKE

lol. um. i dunno who would win o.o

Kenshin v. Inuyasha! (kenshin)
Haru v. Ed from FMA (Ed)

Definitely Ichigo and Mugen. Wow, that'd be an awesome fight.
Also, Saitou and Jin would be a nice one.

- Solipsist