What are the biggest (most important to their series) characters introduced since the end of 2015? This is so I can get into Smash speculation again, and so I can make a hack involving said characters. My current roster is only filled with All Stars (IMO): Ridley, Skull Kid, Dixie Kong, Toad, and Ashley.
So basically, characters that have been introduced in 2016 and 2017?
I'll go series by series.
: None, really. No new ones have really been introduced. Odyssey is bringing in folks like Cappy, Tiara, and Talkatoo, but to say they wouldn't fit into Smash is an understatement. Captain Toad, Toadette, and Pauline got more important despite being introduced before 2016.
: Hasn't had a game the past two years. N/A
: See Mario. Maybe Poochy got slightly more important...?
: See Donkey Kong.
: Breath of the Wild introduced the Champions, but they're almost certainly going the way of the Seven Sages or Groose and only being important to their one game.
: Federation Force had the Galactic Federation Troopers, I suppose. Sylux may get expanded on more in Prime 4 despite being an older character.
: Suzie Haltmann is pretty popular I think? And Bandanna Dee and Magalor have made more appearances despite being older.
: None of note, really, beyond the Star Fox 2 cast being canon now.
: Decidueye, Lycanroc, and Mimikyu have been consistent as some of the three most popular and promoted Alola Pokémon. Incineroar and Primarina, too, by virtue of being the other starters.
: Forget the past two years, F-Zero has been gone for more than a decade.
: See Donkey Kong
: Not including Fates characters (since that was 2015 in Japan), there's been Shadows of Valentia, Heroes, and Warriors. SoV is a remake so Alm and Celica don't meet the after-2015 criteria. The rest are crossover spin offs, though those and amiibo presence help resolidify Alm, Celica, Lyn, Chrom, and Tiki as very important characters to the series. The unnamed Switch game will undoubtedly have a new main hero.
: See Donkey Kong
: Hey! Pikmin doesn't introduce new characters.
: Though she's a 2013 character, Isabelle has been firmly solidified as the mascot character and is by all means an all star.
: See Donkey Kong
: See Donkey Kong
: Rex and Pyra from the upcoming XC2 are the main characters, which helps in a series like Xenoblade.
New Series: Inklings for Splatoon continue to gain traction despite being from 2015, Spring Man for ARMS.
Didn't include third parties, retros, or Miis.