Ideas/Suggestions for the rest of Hero's

I currently have made Koss, Olias, my 2 Healer heros "into" a build. I was wondering what you people did with the Other Warrior (Knockdown maybe?) and such. As is I still have to fill build "ideas". You dont have to give me a skill bar but an idea of a build would be great because i have only ever played a monk (and for 16 months i might add).
Current Unfilled "builds"
Elementalist 1: Maybe a Fire Build, but I heard heros cant manage ele energy.
Elementalist 2:
Ranger 1: I have Barrage and Broad Head Arrow, maybe make 1 a interupt.
Ranger 2: And the other a Barrage? I heard that Jin is a great "touch" ranger though. I might want to try that out.
Mesmer: Interupt?
Warrior (2nd): I have no idea for a 2nd war. No idea why they even gave us one when we are still missing a Rit... but yea maybe a Hammerdin Knockdown?
Paragon: ??? I haven't even created one yet no idea's here
Dervish: Something i guess with Avatar of Balthazar, that spell looks ridiculous.
Necro (2nd): Maybe a Blood Necro for backup?
Assasin: Umm... Critical strikes?
If people could just post build "types" and not builds if they dont want to, i would be happy to look up and do the work to make my own build. But i have no idea were to start seeing as how I never played any of these classes. Thanks in advance!
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Either Koss or Goren is great for KD. Just give them the stoneskin inscription and you'll love the 3 second KD, much better than an interrupt at certain times. But I let them using Devasting Hammer (e) and Counter Blow as primary KDs. Devasting is an instant KD and causes weakness. And almost all foes attack.

I also tried using Dwarven Battle Stance which makes you attack 25% faster and interrupt each hit and use counter blow + on your knees to bring back DBS back. Also kind of works with renewing smash but energy management for a warrior seems to be a big issue. Goren does alright with it though. But I'll probably prefer having him do KDs instead.