Incidental 69 is a light orange fish who first appears in the episode "Pickles."
He is a light orange fish with a big lime green fin on his back. He wears green pants and a white T-shirt. In his earlier appearances, his mouth is more squiggly and he has light green stripes on both his sides.
He makes many cameo appearances throughout the series, commonly at Goo Lagoon. In the first ten seasons, he usually appeared as a quiet background character. He first appears as one of the many fish at the Krusty Krab in "Pickles."
His biggest role yet is in the episode "Ink Lemonade" where he is the first customer at Patrick's lemonade stand, but gets sick due to the black lemonade tasting terrible. When he later finds out that the lemonade Patrick has been selling is really Squidward's ink, he gets sick once again.
In "Boss for a Day," he begs SpongeBob to give him napkins after he is seen covered in grease.