For the Water Whale, I'll suggest Splashfins

Why? I have always loved the ideology around water/fluid being formless and able to move without being obstructed by anything.

It will send a direct message to the players to always remember mobility is important in the game of life.

This way, their opponent will not be able to find them easily enough to attack them. After all, it is said that you can't attack what you can't see.

Also, accepting to take up a form means opening yourself up to be attacked. But if they are as formless as water, the long-term disaster that comes with inflexibility will be far from them.

By accepting and embracing formless, they will be able to make sure that when they attack their opponents, they won't be able to get away.