maybe a quote?
"A real ripper enjoys the hunt."

or maybe:

Stefan: Your blood is the cure.
Klaus: Gotta love mother nature.

Klaus: Hello my lovelies, are we ready?

"A real ripper enjoys the hunt." - this one is perfect.

"That's the Spirit"

"Look, I promise I'm not a serial killer" 3x01
"I broke the curse: I killed the werewolf, I killed the vampire, I killed the doppelganger" 3x02
"You're the only comrade I have left" 3x02
"You've heard of me... Fantastic!"
"So, a hybrid walks into a bar, says the barman--" 3x03
"I'm not mad... I'm just curious." 3x04
"You are supposed to be dead! What are we gonna do about that?" 3x05
""

1: "You've heard of me... Fantastic!"
2: "Look, I promise I'm not a serial killer"
3: "Hello my lovelies, are we ready?"

"I will kill you and everyone you've ever met" 3x09

Maybe i't time to do a pick about the motto :)

"I will kill you and everyone you've ever met."

Like this one !! or this one : “Love is a vampire's greatest weakness. And we are not weak, Elijah. We do not feel and we do not care.”

"“People have been after me for a thousand years..and I’m always one step ahead. So whatever it is you’re thinking of trying, go for it. Give it your best shot. You won’t succeed”