Johnny is a character that while doesn't play a big role in the Fighters of Lapis series, he is still a key character in terms of relationships with other characters. His biggest role is being Nostalgia Critic's confused ally/enemy.
Johnny's moveset is based off The Room, a perfect bad movie. Nostalgia Critic ripped into it before it was taken down by his company, making the relationship a lot more personal.
In Fighters of Lapis, he appears as an unlockable character in every installment since the second one, although he was omitted from the fourth. He appears as a slave in End of Days, and helps take down the Aurum.
He is considered a joke character, even though he has a real moveset. He is a slow character.