2) I think your HP is figured wrong... with 13 HD
Actually, 12 HD, but it was off a tad. Lowered its HD at the last moment and forgot to adjust.

3) I agree with seffbaslisk, the -1 Will Save could probably tempt players to try to mind control it... not a good thing.
Mindless creatures are immune to mind control. There, made special mention of a lack of intelligence makes one immune to mind effects.

well, in its natural habitat, it considered preteen kids with wetsuits and a football helmet heroes.

Yeah, it'd have to be defined by the DM, as 'hero' is pretty hard to define ;)