In my happy little world, kraata existed even before
makuta came to mata nui. multiple species existed, the 
largest and rarest of all being the king kraata (y'know,
like a king crab, only in kraata terms.) king kraata
eat just about whatever they wish, including other kraata.
anyway, when makuta invaded the island, he realized that
these kraata were perfect little goobers to do his dirty
work. so, he infected them all with his evilness and sent
them on their merry, brainwashed, kanohi-infecting way.
all except one. Draco, the highly intelligent, self-named
king kraata. he despised makuta for infecting his brothers,
and in revenge, vowed to put an end to it, even if it
meant eating every last freaking kraata on the island.
draco spent most of his time crawling around the lava
tubes of the mangai volcano and the canyons of po-wahi, 
since they had the highest kraata (read: draco munchies) 
population. he just hapened to be nearby when (see 
comic#11) the cavern full of kraata pohatu, whenua, and 
onua were in, collapsed. he crawled to the scene and
found a veritable moving buffet, along with three other
two-legged things of little importance. once the toa
and turaga were free, they thanked draco for getting rid
of the escaped kraata. they then told him of the rahkshi,
and he agreed to fight with the toa in exchange for all
the kraata he could eat. don't believe what they put in 
the comic, they just want to make the toa the heroes.
Draco, or Kanohi draconus, can enhance the brute strength,
speed, and reflexes of the wearer, as well as supplying
superior senses and moments of beserker rage. so far, 
onlyTahu has been able to control the power that draco 
can provide, much to the relief of the other toa. their
sentiments can best be summed up in lewa's quote: "I'm 
happyglad we have another goodfriend, but I don't want 
a stickyslug on my maskhead!"