The blue one

Once upon a time, there was a blue circular figure with arms and legs named Blue.
Blue was walking through the endless white void he lived in. Everything seemed peaceful and quiet.
Suddenly, a giant black creature appeared behind him. It was tall, dark, and shaped like a snake. The monster opened its mouth and lunged at Blue.
"Ahh! Someone help me!" Blue cried.
Just as the snake monster was about to attack, a red circular figure rushed in from behind. Holding a knife, he leaped through the air and stabbed the monster.
A burst of purple energy exploded from the wound as the creature recoiled.
The red figure landed beside Blue and said,
"You should watch out next time."
Blue stared in amazement.
"Who are you?" he asked.
The red figure smiled.
"My name is Red."
As the wounded monster began to rise again, both Blue and Red realized their adventure was only beginning...
To be continued...