As for Hunahpu being a character that relies on speed I want him to be skinnier and more slick. The actor I had in mind on basing this character on was Andrew Garfield. I wanted to convey a clever but cocky teenager and I think from Garfield's portrayal of Peter Parker in The Amazing Spiderman that he will suit well.
The anatomy of the two characters definitely needs to be worked on I think Xbalanque being the stronger starter in this case. I need to revisit building the characters from shapes to refresh my memory and makes these characters great. My idea behind the type of build that I want the characters to have is similar to that of two heroes from the game Mini Ninjas found below.