So following the criteria layed out for Ultimate, Here's a Cartoon Network.
A good chunk of Ultimate's roster is comprised of Mario characters. Mario has been the flagship of Nintendo, with media spanning multiple generations of audiences, both old and young. With so much, it's damn near impossible to ignore him. With CN, the closest we'll ger to that, in my eyes, is hands down the Powerpuff Girls. Spans multiple generations? Check. Is ****ing everywhere? Check. A loveable cast of characters? Check.
So for the PPG, we have: Blossom, Buttercup, Bubbles, and Mojo Jojo, who are equivalent of the main 4 of Mario (M,L,P,B). Spoiled brat in a mech? Princess. Tag Team duo with a very tall lady and her goofy sidekick? Bellum and the Mayor. Joke character? Some generic mook.
But Mario also extends even further, with the spinoffs being represented. We have Yoshi, Dr. Mario, DK, and Wario? On the other hand, PPG has a lot of reboots and spinoffs, as such, to round them out, we have:
Bliss from the 2016 PPG, Dance Pantsed Blossom, and I guess the a Rowdy Ruff Boy for Wario. As for DK goes, this will be from PPGZ, so Anime Blossom, Anime Bubbles, and Anime Mojo Jojo.
Zelda's pretty popular, usually the 2nd in command for Nintendo. Has a relatively small cast who's strength comes from the story and the world. To me, the equivalent to that is Ben 10. For this, it will be: Ben 10, Gwen, Vilgax, and Kevin. But wait, what about the other Links? Well, for that, I'll say Young Ben, and (I'm sorry) reboot Ben 10.
Next up on the list, a relatively popular series that's seen a massive resurgence in popularity as of late. Yep, this one's Metroid, and it's been around for quite some time, but never reallt pulles in the numbers, but it's rather darker and more serious, especially as the series progressed to a more adult nature. Sounds like a CN show... yup, Samurai Jack. So we'll have: Jack (Title Character), Old Jack (Same character, but from a more recent entry), Ashi (Character from a reboot), and Aku (big villian).
Next up is a pretty popular series, that is knowm for a small but lovable cast, with a goofy tone and bright colors everywhere, it's prone to obliterating the 4th wall time to time. Kirby=Ed Edd and Eddy. For that, just Ed, Edd, and Eddy. The big 3. Like Kirby.
Next up, Star Fox. Uh, it's classic, but it's relatively new in comparison to other series. Idk, Billy and Mandy. Billy, Mandy, Grim. Idk, this one's a bit tough
Next up, we got Pokemon. Oh dear god. A varied cast and crew, extremely popular, not fully owned by Nintendo. Spans multiple gens? My best bet for this? Total Drama Island.
Majority is Gen 1, so uh...: Duncan, Gwen, Chris Mclean, (Owen, Heather Harold) as a tag team, Mal, Shawn. And unfortunately, that's about as high TD gens go, but if I wanna fill ot out: Chef for Incineroar, Ezekiel for Greninja.
Next up, F-Zero. Futuristic series that will never ever get a sequel despite fan clamour? Generator Rex.
Next up, Earthbound. Small, didn't last long, but a huge cult following. Imo, Chowder fits this bill. Chowder and Schnitzel for these two.