Nope. I'm going to make them all adorable and cute, but to an extent to where they aren't incredibly ridiculous. One has to remember that not all Sharks and Stingrays will give you diabetes when instantly seen by even the most pure of human eyes, oh no no, some Sharks and Stingrays will give you the darkest of nightmares imaginable. Let's start with the abilities, shall we?
But first, let me explain how this is going to work for Sharks. Sharks will have a permanent ''Current'' buff, which has a current of magically oxygenated water flowing past their gills and around their body in a large sphere. The water, so it doesn't tire the animal out, flows slowly enough so that the animal can stand motionless and still breathe. Stingrays will simply have a water sphere of motionless water, as they don't have to constantly move to take in oxygen. The spheres disappear when the pet is taken into water but reappear when taken out.
Main Abilities.

Just a Nip!
- Instant
- 10 second cooldown
Your Shark or Stingray nips the target, increasing all damage taken by 4% for 30 seconds.
Or. . .

Swift Swim
- Instant
- 2 minute cooldown
Your Shark or Stingray drenches everyone in the magical water that surrounds it, refreshing them and increasing their haste by 5% and run speed by 20% for 10 seconds.
Or. . .

Dark Waters
- Instant
- 2 minute cooldown
Your Shark or Stingray swims into the darkness, and then, after 3 seconds, it hits or stings the target, stunning the target for 5 seconds.
Or. . .

Spawn of Epicus Maximus
- Instant
- 10 minute cooldown
Your Shark or Stingray becomes filled with the epic quality that was once contained in the most epic Shark of all time. . .EPICUS MAXIMUS! Once embodied with it's new epic powers, any attackable target within 25 yards of your pet will run away in terror for 10 seconds.
Fun Abilities

Snout-touching Fetish
- Instant
- 1 second cooldown
You rub your Shark or Stingray's snout, making it like you a little more than usual.
Or. . .

Frickin' Laser Beams!
- Instant
- 1 second cooldown
Your Shark or Stingray shoots laser beams around, causing everything to run away in terror for 5 seconds. Note: Does not work on endangered species, as it would take months to clear up the red tape.
And that is my gigantic wall of ideas!
*Because I'm highly paranoid about the smallest things I read about, I'm placing this down here because I read somewhere on the internet (Yeah I know, it's the internet) that Blizzard usually doesn't use fan ideas posted on forums is because the people who made said ideas might take copyright actions against them. So, feel free to use this, Blizzard.*