Shannon's resolve and her personality are really what mark her as an awesome character for me (and also mark Umineko as a better-written series than Higurashi *dodges dishes*). She's got a really strong idea of what she wants but is also...well, moe meido enough that she's still soft? All in all, she's a well-rounded character.

Battler is just LOL to me. Him and his trademark lines really have a feel of "OBJECTION" to them, and god he's so damn cute and total determinator to the max. I don't think anyone can maintain that sort of composure and optimism whilst being put through the emotion/physical wringer like he is.