
I would imagine they'd be more like the orange. Here, it would be 30 HP and 30 MP.
As for other stuff, I drew three sodas.:

Cyro suggested the sodas provide a temporary increased mobility status called "sugar rush." I feel this would also be a nice way to make the sodas stand out from other consumables. If they HAVE to be bland and boring, I'd be fine with flat MP boosts.
The important question here is Pepsi (Squishee) or Coca Cola (Logon Cola)? I added Mountain Dew (Valley Mist) to the mix as a third party.
Thirdly, here's a Burger Boys uniform:

Lastly, as fast food corporations are known to be shady when it comes to what food they serve, here's a monster for Burger Boys: the Pink Slime.

In terms of drops, I would suggest the following: the entire Burger Boys set, a Hamburger, Fries, Chicken Nuggets, one of the three sodas, a Carving Fork, a Straw Hat, a Club (because it looks like a drumstick), a Hamburger Hat, a Hamburger Suit, the entire Pollution set (or less depending on its stats), and Stage 2 Poison and Stage 2 Fire Runes.
But yeah, there's that.