Character Appearances

For access to all of SpongeBob SquarePants' appearances in the franchise, go to SpongeBob SquarePants/Appearances
For access to all of Gary the Snail's appearances in the franchise, go to Gary the Snail/Appearances
For access to all of Patrick Star's appearances in the franchise, go to Patrick Star/Appearances
For access to all of Squidward Tentacles' appearances in the franchise, go to Squidward Tentacles/Appearances
For access to all of Eugene H. Krabs' appearances in the franchise, go to Eugene H. Krabs/Appearances
For access to all of Sandy Cheeks' appearances in the franchise, go to Sandy Cheeks/Appearances
For access to all of Sheldon J. Plankton's appearances in the franchise, go to Sheldon J. Plankton/Appearances
For access to all of Karen Plankton's appearances in the franchise, go to Karen Plankton/Appearances
For access to all of Mrs. Poppy Puff's appearances in the franchise, go to Mrs. Poppy Puff/Appearances
For access to all of Pearl Krabs' appearances in the franchise, go to Pearl Krabs/Appearances
For access to all of Perch Perkins' appearances in the franchise, go to Perch Perkins/Appearances

Here are a few rules:

Nicktoons crossovers are counted.
Bold means the character was the main character of and/or played a major role in a specific episode, movie, short, book or video game.
Italic means the character appears in a feature-length movie, a book, a video game, or a musical. It is also used for the titles of television shows that the specific character appears in.
Episodes where a character cameos, appears in a deleted scene, appears as a entirely different character not related to him/her/them or appears in a time card (e.g. Born Again Krabs), as well as episodes where only his/her/their voice is heard, count as episode appearances. However, episodes where a character is a entirely different character related to him/her/their (e.g. the robots n Welcome to Binary Bottom) do not count.
All episodes are listed by production order unless an episode has only one segment broadcast at the moment. Upcoming episodes with available screenshots are acceptable.