can someone name some animê character that would be great in a war?

Erza Scarlet from Fairy Tail.
:)

(from left to right)may-rin(red hair) finny(orange hair) bard(yellow hair) sebastian(black hair) ciel(blue/black hair) and tanaka(white hair) from kuroshitsuji/black butler but i don't think tanaka would be good in war because he does almost nothing sebastian is a demon ciel is contracted to sebastian so he can control him may-rin was a snipper finny has super human strength bard was in the war and was the only one who lived plus ciel and sebastian always win because after all sebastian is "one hell of a butler" and ciel is "one hell of a demons master"

shizuo heiwajima from dararara

could kill millions in his violent rampage

Undoubtedly Riza Hawkeye from FMA. That chick is legend with a gun!

son goku from dragon ball z

Dude, these three would be EPIC in a war xD Have you SEEN them fight each other?! <3

anyone in Sengoku Basara, but I went with my personal favourite: Masamune Datte!

Death the Kid from Soul Eater

Sousuke Sagara from the Full Metal Panic franchise. A child soldier, the battleground was his nursery, and the art of war was all he knew until he met Kaname, who showed him a whole new world.

I think that these two would be excellent fighting in A war. I know that they actually both have. One of them is Tres from Trinity blood and the other is Major Mokoto from Ghost in the Shell.
Tres in picture.

Japan, Kiku Honda from APHetalia!

I can think of two.

Vash the Stampede (left) from Trigun. Not exactly a killer, but he's a superb gunman, and he's perfect if you're trying to avoid unwanted casualties.

furgão, van of the Dawn (right) from Gun X Sword. Once he's got his mind set on something (in this case, a war he's caught up in), nothing can distract him. Great for close combat, thanks to his shape-memory-alloy sword.

Gintoki from...gintama...

germany from hetalia!

Goku

1.Russia from Hetalia
2.Germany from Hetalia
3.L from death note (i think not)
4.Crona from Soul eater
5.Maka and Soul from Soul eater
6.Stein and Spirit from Soul eater
5.Death the kid/Liz and patty
7.Lord death and Spirit

*Waits for all the hetalia - axis powers respostas to flood in*

Lucy from Elfen Lied
Uryu Ishida from Bleach
Kouta from highschool of the dead

link

Black Butler:
Sebastian
Mey-Rin
Finian
Bardroy
Undertaker
Claude
The Terror Triplets

Soul Eater:
Professor Franken Stein
Lord Death
Spirit
Maka and Soul
Death Scythe Justin
Death the Kid, Liz and Patti Thompson

Fullmetal Alchemist:
Roy Mustang
Riza Hawkeye
Father
furgão, van Hohenheim
Alex Louis Armstrong (He may not like killing but he is one BAMF)
Kimbley
Ling and his 2 gaurds

Naruto:
Itachi Uchiha
Kisame
Hidan ( He is worthless except the fact he is immortal)
Kakazu
Pein
kakashi
Might Gai
Tsunade
Jiraiya
Orochimaru
NOT SAKURA DEAR GOD NO!
Gaara
shikamaru (strategy and awesome shadow stuff)
Neji

D.Gray-Man:
Allen
Kanda
Lavi
Krory
Tyki
Rhode
The Earl

Deadman Wonderland:
Shiro
Makina
Senji (Crow)
Toto
Minatsuki
Chan and En

07 Ghosts:
Teito
Frau
Castor
Labrador
Ayanami


Thats all I can think of right now. Sorry if thats too many!

Mariko from Elfen Lied

Yuri from angel Beats!

Tales Of The Abyss
- Tear Grants
- Luke Fon Fabre
- Asch
- Guy
- Natalia / Meryll
Tears To Tiara
- Arawn
- Arthur
angel Beats
- Yuri
- Kanade
- Otonashi
- Shiina
Darker Than Black
- Hei
- Yin
Kore Wa Zombie Desu Ka
- Haruna
- Seraphim
Kara No Kyoukai
- Ryougi Shiki
Hidan No Aria
- Aria

These guys! XD they no war all to well!

Jormungand

noda from angel beats!!

what i like most is his personality....