On that note I've reworked mine to exclude Wario and Donkey Kong exclusive characters:
Mario Bros. Smash 64
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The BIG 8, plus Jr who is very important, Kamek who is pretty much Yoshi's rival and an often forgotten big leader of the Koopa Troop, the most memorable Mario RPG character to date and a forgotten relic in Wart.
Mario Bros. Smash Melee
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Adding vital staples like Daisy, Waluigi, Toadette, Diddy, Rosalina, Birdo and Nabbit as well as some more RPG rep in Mallow and Geno for SMRPG, Goombella and Vivian for the Thousand Year Door(which is the best RPG to date, fight me), the first boss in Mario 64 and another forgotten Mario character in Tatanga similar to Wart.
Mario Bros. Smash Brawl
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Decided to do a pair up thing for this version; Nabbit, someone who likes stealing treasures teams up with Captain Toad, another Treasure Tracker. King Boo and Petey become partners in crime once again with the moon and sun theme going. Pom Pom and Boom Boom, canonical partners team up too. Pauline teams up with Mario's Odyssey partner since it's her big come back, Ludwig teams up with the leader of the Broodals and a pair of wise old men finish the roster.
Mario Bros. Smash For
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Unbelivably I still hadn't added the two most iconic minions, so Koopa Troopa and Goomba join the fray. Draggadon and Wingo, Captain Toad's nemsis join the fray too. A pair of phony Peach's make it in too. Honey Queen due to that one Mario Kart appearance that was weirdly memorable and Wendy, Morton and Iggy hang with their Broodal counterparts. Larry, Lemmy and Roy join to complete the Koopalings, Plessie and Boshi join as a couple of additional rivals to Yoshi. Polterpup joins giving Luigi more allies. Felt Sunshine needed another character so in came Il Piantissimo. Felt Paper Mario could do with a little more so here's some villains!
Mario Bros. Smash Ultimate
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Added a few more Mario and Luigi characters, the Glitz Pit has always been my favourite level in any Mario RPG so Rawk Hawk was a must have, Whomps(and indeed Thwomps) don't get much attention so I added the King. Baby Mario and Baby Luigi are staples, and whilst I can't say I enjoy the babies being in every Mario Kart the baby bros. probably deserve a spot by this point alongside Dry Bowser who is also very popular. Shy Guy and Lakitu give us a few more iconic minions, Wanda is another forgotten Mario character I'd love to bring back, Luma is pretty important by their own right and lastly the most important character of a good bitey boy in Fighter #70.
There's actually still a fair few Mario characters I want to add too, but 70 is the limit Ultimate currently has so I figured it best I stuck to that.