"What kind of serial killer are you?"
I'm the one who no one would suspect of being the killer. My only victims are my enemies, because I'm not one to kill somebody I don't know, unless they're trying to stop me, in which they become an enemy.
I'm the killer who actually makes the world better, because my victims would be better off dead, and I'd be doing the world a favor.
"What is your preferred method/weapon of killing? (example: I choke them with a piano wire)"
Slow, agonizing torture. I'd keep them chained up, and I'd deform and hack away at my victim's body until they pass out, in which I wait for them to awaken. I'll keep this up until they die. I'll tape my killings (masked of course) and send the tapes to the authorities, being sure not to leave any tracks or ways of being traced.
For enemies, it depends on how much I hate that person as to whether I'll be masked or unmasked. For those I hate the most, I'll do it unmasked. I'll get in the victim's face about how much pain the person's caused me, and watch as he/she begs for his/her life. I'll tape it, but if the person says my name or if I make the mistake of showing my face on camera, I'll keep the tape for memories.
"Do you go after certain victims? (example: I only go after blondes)"
I only go after those I hate. There's no point for me to victimize a person I don't know unless they get in my way.
"What is your preferred method of disposal? (example: I eat it)"
No need. I have two different houses, my own home, and my "working" house, which has a dungeon-esque basement. The entrance to the latter is chained and padlocked, and only I know how to get through it. I keep the bodies there until they really start to smell, in which I hack the bodies apart (keeping the head), and burying the parts DEEP underground, or leaving them in a sewer somewhere.
"What is your favorite time to strike? (example: night)"
Most definately night. It's dark, and it's hard for other people and my victim to see me. But, I have good night vision and sharp hearing, so it should be no problem for me to get to them.
"What is your reason for killing? (example: the sinful standards of society)"
Revenge. All my victims were those who caused me pain, whether it be physical or mental. Seeing as how I'm a nice person, unworthy of such torture from other people, they qualify as scum to me. And therefore they have to die, horribly.