Nynaeve was sort of irritating
Rand was too serious
Lan was stoic but that's cool :p
Lews Therin was crazy awesome
Thom and Min favorites among the non-main characters, cant really say about the main cast
Brown for the unending quest for knowledge, all hail wikipedia and google
White for crystal clear rationality, not all that concerned about philosophy
Green for the adventure, though I'm not really a fighter or confronter...rather use the brown and white sides to get out of those sticky...