Brawl newcomers who debuted in the 1980s
always gotten a handful of cameos for over 20 years before getting a playable role in Mario Kart DS so he was a retro newcomer
one game in 1986, another game in 1991... then nothing but a GBA port in 2004 so he was a retro newcomer
always had several games throughout the 1980s, 1990s, and 2000s so he was always there to maintain his popularity
Brawl newcomers who debuted in the 1990s
always been around since the 1990s with lots of games to keep up his popularity
always been around since the 1990s with several recurring appearances in Kirby games to keep up his popularity
always been around since the 1990s with many recurring appearances in Mario party/sports games to keep up his popularity before reinventing his image in 2003 with WarioWare series
always been around since the 1990s with several recurring appearances in Kirby games to keep up his popularity
always been around since the 1990s, even when the DKC franchise was dormant he still had lots of recurring appearances in Mario party/sports games to keep up his popularity
always been around since the 1990s and became relevant again in 2004 with FireRed & LeafGreen
recurring character since Star Fox 64 and appeared in Star Fox Assault and Star Fox Command
Brawl newcomers who debuted in the 2000s
the only brand-new franchise since Melee with two games at the time
a recurring version of child Link since Wind Waker; Zelda is a long-running franchise
a new version of Samus since Zero Mission; Metroid is a long-running franchise
a new protagonist of the latest game in the long-running franchise of Fire Emblem
a new protagonist of the latest game in the short-lived franchise of Mother; also Mother 3 temporarily revived the franchise after 12 years of no games
a new popular Pokemon from the latest games in the long-running franchise of Pokemon
SSB4 newcomers who debuted in the 1980s
always been around since the 1980s with dozens of games to maintain his popularity but people think he had no popularity and was shoehorned in as a favor to Namco
had a couple arcade games and a NES game in the 1980s and only one SNES game in the 1990s before disappearing completely for 15 years before being revived with a new Wii game but since Little Mac didn't have many games between SNES and Wii, people still see him as either a retro character they remembered or as a brand-new character from a brand-new franchise they didn't grow up with
had only one game in the NES and a few cameos for 30 years so he is the retro newcomer
like Little Mac, she had a game in 1986 and another one in 1991 before disappearing completely for 25 years before being revived with a new 3DS game but people still see her as a retro character they remembered or as a brand-new character from a brand-new franchise they didn't grow up with
had many games since the 1980s to maintain his popularity and as a result, people grew up with Mega Man
SSB4 newcomers who debuted in the 2000s
a brand-new franchise that debuted in the same year as Melee (in Japan, that is) so to older Smash fans, Animal Crossing still feels like too new like Pikmin since they didn't grow up with Animal Crossing but to younger fans, they grew up with Animal Crossing
a new recurring character from Super Mario Sunshine in 2002 so to older Smash fans, they still see Bowser Jr. as too new and some might resent him for replacing the Koopalings (at least they are in too) but to younger fans, they grew up with Bowser Jr.; he is also from a long-running franchise of Mario
a major new IP from the Wii era since 2006 so they still feel too new to older Smash fans who yearn the 1990s and they feel that Miis are shoehorned in everything but to younger fans, they generally love these avatars.
a new recurring character from Super Mario Galaxy in 2007 so to older Smash fans, they still see Rosalina as too new since she didn't have as many appearances as Waluigi and Daisy did but to younger fans, they grew up with Rosalina; she is also from a long-running franchise of Mario
a major new IP from the Wii era since 2007 so she still feels too new to older Smash fans; worse yet, she hails from a franchise where Smash fans are not the main demographic (must be why she was unexpected)
SSB4 newcomers who debuted in the 2010s
a niche new IP since 2010 so he is very obscure compared to most characters and he is too new so people didn't grow up on Xenoblade Chronicles (people will grow up on it in 10 years from now like what happened with Golden Sun)
a new character from a new game in a long dormant franchise so naturally, people didn't grow up with Dark Pit
new characters from a long-running franchise of Fire Emblem so people didn't grow up with them unless they were preschoolers
a brand-new Pokemon from a long-running franchise, of course people didn't grow up with Greninja