i say give him the AK! haha jk.
i agree with Sumo. i think either the Weiner Dog or the MPLE would be perfect. the S5 is a good size, might be a little big for his hands, but i wouldnt know. i think a Yard Keeper would be good too.
if you didnt mind giving him a blade that wasnt SYKC, i think either a mora or a RC-3 would do the job.