User blog comment:TheOriginalVampireKlaus/Lydia may be the reptilian shifter/@comment-190.177.196.40-20120619171237

Jackson and Lydia are A) Too obvious and B) regulars in the cast. Whoever's the Kanima is going to get killed off at the end of the season and the show's too young to start doing that to regular cast members yet. It's going to be someone we haven't met yet.

Also, the show's dripping with foreshadowing. The hunter the creature killed was 24, the mechanic was an ex-lacrosse player of roughly the same age and the only one who doesn't fit age-wise is Isaac's father. I personally think they're going to go for another revenge killer. The creature might be targetting people who made their life hell in high school (the mechanic looks like the typical asshole jock like Jackson, the hunter guy could have been in on the bullying too, and we all know Isaac's father has a thing for beating up teenagers) and only recently became a shapeshifter due to some event we haven't seen yet. The connection with Stiles is fuzzy, but it could've been some older kid Stiles befriended when he was younger and then forgot about it, or it could be someone he's related to.

The way I see it, they're going to keep targetting people in the age-range (possibly including teachers/principals/coaches who were either in on the bullying or sat back and did nothing) and we're not going to find out who it is until the penultimate episode. The culprit, of course, will be presented innocuously in eps 5, 6 or 7.