A very big human, carrying around a big rock.
I think it fits perfect to Behemoth
An idea, when he stuns he slams the rock in the ground, causing the the ground in a line to either fall uopon itself or raise, like the old behemoth. Other animations should be with the rock slaming, just like old behemoth.
Check him out at link. http://www.frithjof.de/asterix_obelix3.gif