There are some figures that are especially created for comic/manga images.  For female figures, there is the Anime Doll in addition to Aiko.  She is available from Content Paradise.  Yuki Terai 2 by e frontier has also been advertised as having a "manga" look, though she doesn't seem to be as popular as either Aiko or Anime Doll.  For males, there is Hiro, who is available from DAZ.  Different artists have also adapted Aiko to produce more manga-style characters such as BelBel, ChibiBel, and others.  If you search the term "anime" at the DAZ web site or here at Renderosity, you'll find all sorts of anime hair, clothing, and so on.

I have Oliver's toon shaders and enjoy them.  You use them by applying them in the material room, which is available in Poser 5 or higher.  They can produce amazing images, but you do have to teach yourself how to use the material room in Poser, which is a little overwhelming at first, if you want to get the exact image you want.  You also have to play around quite a bit with the lighting.  However, the shaders work on any character, and you can produce the basic picture right in Poser.  You could make a superhero character by applying them to any of the realistic male or female models with capes, skin-tight bodysuits, and boots, or anime characters by applying them to the characters I mentioned above.

I hope this helps.