He provides genetic material to all spawned PlantSim toddlers. The game uses his genetics and that of the Sim who spawns the toddler, as in a normal birth. However, he does not appear in the family trees of PlantSims. For example, he is technically Daisy Greenman's father, but he isn't on her family tree, which simply shows Rose as her mother.
His name in-game is in all lower case characters. Despite having the last name PlantSim, ideal does not have green skin or PlantSim hair. Due to that, it is presumed that his only function is to transfer genetics to the compilation of genes for newly spawned PlantSims. His hair is the same hair that Sims get after being electrocuted.
When a PlantSim gives birth, he will show up for a split-second in the toddler's family tree. ideal is voiced by Stephen Kearin. His clothing and hairstyle are available when Create-A-Sim is in debug mode. When viewing ideal's character data in SimPE, it is determined that he is an object, meaning he cannot be played, though the player can create a Sim that looks like him in debug mode and name it ideal plantsim.
However it can be troublesome to replicate his exact face without cloning him, which itself is very complicated since his appearance can't be extracted directly. An exact replica of ideal can be downloaded here. This is one way of playing as ideal plantsim without the risk of corrupting the game, except that he will be treated as a regular Sim, without ideal's unique behaviors. He has no personality points or interests. Also his zodiac sign is not recognized when viewing SimPE. However, when viewed in-game, he is a Cancer.