Sorry to pick at your wording, but this is the top 100 highest grossing animated movies of all time, Jimmy doesn't appear
This chart contains the top 100 animation movies based on the cumulative worldwide box office.
www.the-numbers.com
There are only 3 adult animated movies on the top 100 (one of which is The Simpsons Movie - a film that was very much marketed to children and is part of a brand that has historically marketed itself to children even to this day). Jimmy does show up in the top 200, but behind films nobody would consider "all time most popular" like the BoxTrolls; Onward; Storks; Robots; and even the just-released Lightyear - as well as fellow straight-to-cinema Nick IPs like Rango; Wonder Park; and Barnyard. Now keep in mind that there's no live action films on this list which would plunge Jimmy down even further considering ET; Home Alone; Sonic; so on.
Jimmy is a hugely popular character, don't get me wrong, but he's remembered more as a TV character than a movie character, and TBH competing with Optimus Prime; Rocky & Bullwinkle; or Finn the Human isn't as high a bar as competing with Simba; Gru; or Shrek so I think the exaggeration here is unjust, even if it doesn't really give or take much to/from the discussion as there aren't many movie characters to choose from in this game in the first case.