Vaka-Waka are two Munchos in one! Vaka is the top-half of the duo and in charge of food input, while stomach head Waka handles the output... whether he likes it or not. Vaka usually eats before thinking, shoving everything into his mouth. That means poor Waka has to deal with digesting everything from rotten fish heads to battery acid! No wonder Vaka looks the happier of this joined-at-the-belly pair of Munchos!
They are very greedy and gluttonous, and are almost constantly eating.