i need some new anime's

Try Hakuouki! It seems to match most of your criteria: sexy guys, romance, violence, cute characters, vampires, demons, comedy, and has several sad aspects.

No.6, SEXY GUYS, yaoi(mild), violence, sad/happy ending

天使 Beats, MUSIC, ROMANCE, SADNESS,Sexy guys

Air-SAD,romance..?

Clannad- MUSIC, ROMANCE, sad/happy ending,comedy

Toward the Terra -MUSIC, violence, sexy guys, SADDEST ENDING EVER GOD DAMMIT

Hmm..

well i know 黑塔利亚 has the following:
-sexy guys
-comedy
-cute characters
- music

Death note is kinda cool too. it has:
-Violence (if 你 count murders as violence)
- sexy guys
- sad ending
- demon/deathgod sorta things

FullMetal Alchemist has:
Violence
Romance
Sexy guys
Comedy
Cute characters
Music
SAD FREAKING BACKSTORY AND ENDINGS!!!! T~T I'll never forgive Roy for uprooting my palm tree...
A few happy endings
Demons(If 你 count the homunculi and Truth as demons...)

Shugo Chara! has:
Violence(just a bit, though)
Romance
Sexy guys
Comedy
Cute characters
Music
Happy endings
Happy storyline

Pretear has:
Violence(and plenty of it)
Romance(It was modeled after Snow White... need I say more?)
Sexy guys(four of them~!<3)
Cute characters(three adorable little kids~!)
Sad backstory(look no further than Mawata Awayuki and Takako)
Happy ending
Happy storyline
Demons(the villains are called Demon Larvae)

I can only give 你 one: Nana. It's a lot to explain so looking it up would be best for 你 lmao.

Uhm it's slice-of-life so it doesn't have demons 或者 吸血鬼 so...yeah o.o And the guys, I guess they're cute I don't really pay attention.

All I watch are Yuris pretty much so yeah goodluck.

inuyasha:violence, romance, some sexy guys, comedy, music, some sad back storys, sometimes sad endings, happy endings, sometimes happy story line, demons, and some yaoi
black blood brothers:vampires, and violence not sher on what elts

Elfen Lied
It has:
Violence
Romance
No sexy guys
Comedy
Cute Characters
Music
Sad back story
sad ending (SO MANY, TOO MANY! DX)
Some happy endings
Not a really happy story line
demons
No vampires
Doesn't have yuri
No girls with massive boobs

try soul eater. It has everything your looking for. Except for romance and vampires

These have most of thoose things 你 want to have in a anime:

Katekyo Hitman Reborn
Soul Eater
Durarara
D.Gray-Man
Death Note
Shakugan no Shana
One Piece
Vampire Knight
Rosario + Vampire
Ao no Exorcist
Yumekui Merry
Black Butler
Shugo Chara
Black Cat
Zombie Loan
High school of death

Monster
Fruba
Elfen Lied
D.Gray-Man
Gundam 00
Pandora Hearts
Wolf's Rain
07-Ghost
Trinity Blood
天使 Beats
Nabari no Ou
Rumbling Hearts
Togainu no Chi