One of the things I love about comic books is the freedom to give a character any voice in your imagination as you read it. I always have the same voice for a character when I read in my head unless I come across a voice actor who plays it really good than I just use their voice. Other times some heroes are different Example- Captain America (Steve Rogers) and Ultimate Captain America. 616 version I imagine this all american deep strong voice and when I read the ultimate version he is more like the strict drill sergeant type and thats the type of voice I give him.   
     
Because I am a 90's kid I always imagine Mark Hamil when I read Joker and Kevin Conroy as Batman. Besides the fake that these are amazing voice actors, I have had those voices attached to those characters for so long, Batman animated series to Justice League, and even Arkham Asylum.  
    
 Recently I have been collecting Red Robin and in the latest issue he fought Catman. I have never read anything with Catman before so the first thing that comes to mind is Adam West's voice. Catman is such a serious character and Adam West;s voice has grown so comedic, but I think it works at least when I read it. 
      
As you can see a lot of the voices I picture are from the media and sometimes I create a voice. What do you guys have to say I would love to hear what kind of voices you imagine with characters.