Jim
First appearing in S1E1A, The Ed-Touchables, Jim is Edd's potted cactus, sitting between his bedside table and the ant farm. Its most notable appearance is in S1E10A, A Glass of Warm Ed, where Edd attempts to use Jim as a weapon and is eaten by Ed.
It also appears in S2E6A, Home Cooked Eds when stolen by Marie and in S4E9B, A Case of Ed in Edd's wagon.
Jim can usually be spotted in most episode showing Edd's room. Which are; S1E5A, Read All About Ed, S1E8A, Fools on the Ed, S1E12B, Oath to an Ed, S2E2B, One+One=Ed, S2E8B, Stop Look and Ed, S2E9B, Scrambled Ed, S2E11B, Mirror Mirror on the Ed, S3E6B/S4E1B, See no Ed, S5E3B/S5E2B, Cleanliness is next to Edness, and S5E5B, Too Smart for his own Ed There are four exceptions; S3E3B, 3 Squares and an Ed, S4E3A, One Size Fits Ed, S5E1/S5E3, Out with the Old in with the Ed, and Special 4, The Eds are Coming the Eds are Coming, all of which only show Edd's room very briefly.
Jim is usually monocolored, matching Edd's wall most times, and is depicted with a white rim on the bottom of the pot in Stop Look and Ed and Mirror Mirror on the Ed only. In Ed, Edd n' Eddy's Big Picture Show Jim was fully colored. Its is shown nearby a film reel labelled "Jim's favorite movie" and two manuals labeled "Jim's Care and feeding auxiliary(???) schedule" and "Jim's care and feeding schedule".