Sorry for no picks...I could not seem to link them right...
For my favourite monster...
If we're talking just for coolsies, Red Eyes Black Dragon (and his cousin Red Eyes Zombie Dragon)
For usefulness?
Either:
Il blud (I don't care if he's an ugly ass fat zombie with a scary face in his chest! He revives my zombies from the grave again and gain to wreck your monsters!)
Or Pyramid Turtle (You kill him and I get to special summon a zombie from my deck. I typically then get out the Red eye zombie dragon or Ryo Kokki)
Favourite spell?
For coolsies? Crystal abundance. Blow up everything on the field in a glorious avalanche of crystals and you get a ton of crystal beasts back to murder your now helpless enemy.
For usefulness?
Zombie world. EVERYTHING on the field is now a zombie. Everything in both graves is a zombie. You cannot tribute summon anything but a zombie. Combined with Il Blud's ability to bring back zombies from both graveyards and Red Eyes Zombie Dragon's ability to steal any enemy it sends to the grave via battle...It's amazing.
Fave trap card?
As awesome as Mirror Force, sakuretsu armor and Torrential tribute are...There is one card I like more. One card that actually TRUMPS mirror force.
DARK BRIBE.
Oh what's that? You're gonna mirror force me? Aww...that's cute. How about I convince you to NOT use that? Here, You can draw a card. But That mirror force is DENIED.
...Why yes, I DO run a zombie deck!
Both in duelist network and real life!