Black Blood Brothers? It's the most accurate one according to your description so far.
>You being seven years old (aired in 2006 so this is the closest one besides hellsing/vampire hunter d)
>Red coat http://images4.fanpop.com/image/photos/22100000/Jiro-Mochizuki-Episode-One-Black-Blood-Brothers-jiro-mochizuki-22171051-720-576.jpg
>Biting neck scene https://myanimelist.cdn-dena.com/s/common/uploaded_files/1483510218-051fc1f36bffaa7f3f0f3540c8d827c5.gif
>Main char's a sword fighter vampire in an era with guns (so it'd make sense why he gets shot at)

arrivederci
i arrive in italian
this is the place where i am presently at with this current announcement which i have just made in the language pertaining to a small bootshaped european country with a mediterranean climate

lol

http://68.media.tumblr.com/cfe9a625da69fa6e1c809c64a4265a64/tumblr_oawmlmoNPB1r3zbhoo1_1280.gif

Originally posted by Brigadier Lethbridge-Stewart:

name

damn i havent seen you in ages how you been

yo what's up

Originally posted by Geech:

The only good ones are the ones that try to emulate Western animation, like Panty and Stocking with Garterbelt Scanty and Kneesocks with Satan.

if you watch enough good anime you'll realize how inaccurate this statement is

Originally posted by ツミ:

I refuse to answer.

fuck i've been destroyed

Originally posted by ツミ:

It's shitty to me because kill la kill being shit is a fact.

well what's your favorites? it'll be cool to know so i can secretly judge you

Originally posted by gabrum01:

I really liked it, it is funny and have action, i dont watch these for a long time

that's cool, glad to see you're enjoying it
and remember: satsuki best girl

Originally posted by ツミ:

keep watching the shitty ones

it's only shit to you because you compare it to the classics like loveless, oreimo, akikan, jojo's bizarre adventure, which is rather pretentious really
tch.......................................................................................................