Victims suck!!!
for my two most played characters:
Samhain, 19 Illusion/Kinetic Controller: "Trick or Treat, Scum" (Samhain is an ancient precursor to Halloween. Make sense now? good.)
Blitzyklon, 10 Kinetic/Electric Defender: "RIDE THE LIGHTNING!!!"
I change em up every so often. Blitz for example is german in origin, so I throw in german phrases every so often. "Wir haben keine zeit!!" stuff like that 
Right now? "hmmm BBQ" i may change it though.. depends how i feel
Ele/energy tech/blaster, mines "Now thats a Shocker!" heh
Scrapper with spines: 'Prepare to be spiked!'
Mine is linked to a key bind "The fires of the Phoenix shall rain down its judgement upon you"!
+)
On Justice
Crime Buster - "You're busted, scum" and "Tell the Warden Crime Buster sends his regards!"
The Silver Sabre (speedster) - "You can't outrun Justice!"
"Welcome to Oblivion!" 
Mine in the Virtue Kingdom, being a Magic Empathy Defender, is "Go Toad!"
Princess Peach
On my "Natural Hero" Magic Defender char :
Let me kill you !
I have to explain that this guy has to be a her because his mom and dad were. He has the traditional comic hero outfit and wear a big H on his chest (for hero of course).
My "Darken Malice" Mutant Scrapper char :
Darkness Guide Me !
She killed her mother with her claw discovering her power, his dad was killed by villain, she now seeks vangeance. The best exemple of someone who would switch to the dark side hehe.
Flick My Bic!
I've got to get it hooked to a macro, but for my kin/radiation defender (specializing in buff/debuff and attacks), I've typed out:
Sucker! I'm not *that* kind of defender... I shoot back!
- Johnny Atomic, Infinity Server
Six String
My scrapper's
"Aw man dont Run."
oh a marco is /marco <macro name> "L <what you want to say>"
L=local channel, you could also do emotes by typing em instead of l
For Johnny Idol, my cocky MA scrapper: "For truth, justice...and the ladies!!!"
I have a Fire Blaster/ Fire Manipulator with glowing eyes ;: "Look Into the Flames of Fury"
For my cat character it's a roared out "Meower Power!"
For my Valkarie it's "By Thor's Hammer!"
For my soul sistah it's "Don't be a Sucka (villian's name)!"
Yeah, I'm having fun with it - so? 
You gonna eat dat?
err you mean ingame, right? 
Justice will win the day!
Lord Morcalivan - "Curse you Statesman!"
Haze - "May Chaos be with you!"
As you can probably tell I am a villain.
Doctor D'Arque - 14 Dark/Dark Defender
"The Doctor is in!"
Confetti - 10 Empathy/Psychic Defender
"Here comes the parade!"
Dies Irae - 5 Fire/Storm controller
"Nil inultum remanebit!" ("Nothing shall remain unavenged!")
Like to keep it simple:
"I'm on 'em..."
Night Gyr - "Wrong move, [Censored]!"
Star Flare - "I'll make you see the light!"
Warhawk Alpha - "No powers? No problem!"
Bridget - "To battle! For the Einherjar!"
The Umber Hedgehog - "Desist, you miscreant!"
Mard'uk - "Me'tek! An shar nan Enlil!"
--All on Virtue
on Pinn. my main char's is :
"On
Ma
Ni
Hatsu
Mei
..un!
Makai Tenjyo!" (Japanese reading of The Mantra Om mani Padme Hum, or The Jewel is in the Lotus, the most common mantra of Tibetan Buddhism)
For my Natural Scrapper Knight Wolf (on Justice): Don't run, you'll just "fall" tired.
For my Mutant Blaster Jacob's Ladder (on Justice): Does anyone smell something burning?
For the Tick Clone I have in my mine (FireDungBeetle): Evil Doer's, Beware my stench!!!
Khaaaaaaaannnnnnn!
No seriously, my character Void Star (Energy/Ice Blaster) dressed all on black rimmed with gold has the battle cry "I am the Light of Darkness!" (For Now)
Do like the title says.
Mine is: UUUUUURRRRRRRAAAA!!!!!! (Traditional Russian battlecry...what can I say..Im sentimental)