Anime like K or Accel World?

Looks to me that you want a nice anime with good visuals a cool soundtrack and cool characters and explosive fight scenes.

*Sword art online (as much as i dislike this show its made by the same person who did accel world but do yourself a favor and only watch the first 15 episodes

* Durarara (K basically ripped of this show with the whole gang thing and yata is reincarnate of heiwajima and isano is a rip off kida)

*Baccano ( a tad older around 2007 ish but still awesome in its own right

*FMA brotherhood ( a little long but you wont be able to stop watching once you get the main flow down.

*Fate/Zero (awesome action it will probably make the genitalia explode seeing how awesome this anime is and if your a female you would probably grow a penis only to explode 23 seconds later. :/ solid truth)

Betrayal knows my name! Shounen-ai, action, supernatural

Togainu no chi! Shounen-ai, action, violent

Highschool of the dead, action, supernatural, little bit hentai.. Not really like K though..

Loveless, Yaoi, action, supernatural

That is all I can think of that is not already listed!

P.S I love K ♥♥

Zetsuen no Tempest, Magi, Code Breaker. Zetsuen no tempest and magi are still ongoing. Not really sure about code breaker yet.

I suggest one of these anime:

Sword Art Online (It's one of the best anime I have watched.)

Chaos;Head (It might blow your mind. But it's kinda confusing if you don't pay attention.)

Hunter X Hunter 2011 (Pure genius)

try Code: Breaker

its really good has some decent character developements and some action.