I’m not sure if we already discussed this, but I’m actually quite surprised at how lacking the fan demand for Ryu Hayabusa is, compared to other popular picks.
You’d think that such an iconic character with a huge history with Nintendo would end up being one of the most requested characters for Smash.
I wonder if people see him too much as just another retro character, or just another sword fighter.
Well, to be as unbiased as possible, Ninja Gaiden is not as huge a franchise as most other 3rd party series in Smash and even ones Ninja Gaiden is competing with to get in. By huge, I mean sales-wise. The most concrete and unbiased way to quantify popularity of a series is no doubt total sales of the whole franchise. To put it into perspective:
Final Fantasy - 142 million
Sonic the Hedgehog - 123.32 million
Dragon Quest - 76 million
Metal Gear - 53.8 million
Pac-Man - 43.243 million
Street Fighter - 43 million
Mega Man - 35 million
Castlevania - 20 million
Megami Tensei - 17.2 million*
Persona - 10 million
Bayonetta - N/A
Banjo-Kazooie - N/A
Fatal Fury - N/A
King of Fighters - N/A*
*included by association of another series
Ninja Gaiden's sales in perspective to other popularly suggested series not yet represented with a playable character in Smash (also includes other Koei Tecmo franchises in comparison to Ninja Gaiden):
Minecraft - 176 million
Resident Evil - 92 million
Tomb Raider - 74 million
Halo - 70 million
Crash Bandicoot - 60 million
Monster Hunter - 54 million
The Elder Scrolls - 52 million
Mortal Kombat - 49 million
Tekken - 48 million
The Witcher - 40 million
Kingdom Hearts - 30 million
Rayman - 26 million
Souls - 25 million
Devil May Cry - 20 million
Tales - 20 million
Dynasty Warriors - 18 million*
Professor Layton - 17 million
Soulcalibur - 15 million
Yo-Kai Watch - 13 million
Bomberman - 10 million
Nobunaga's Ambition - 10 million*
Dead or Alive - 9.7 million*
Doom - 8.5 million
Ninja Gaiden - 7.705 million
Ace Attorney - 7.1 million
Samurai Warriors - 7 million*
Chrono - 5.4 million
*Koei Tecmo's other franchises
Source: Wikipedia
The list may seem a bit arbitrary at times but the point is Ninja Gaiden is quite low in sales compared to other popularly suggested 3rd party franchises. It's not even the best selling Koei Tecmo franchise by any means, even Dead or Alive narrowly beats it out
probably because waifus.
The actual answer as to why Ryu Hayabusa and Ninja Gaiden are unpopular suggestions for Smash are really hard to pinpoint. It could be because Ninja Gaiden on NES wasn't quite as popular as Mega Man and Castlevania possibly due to its harder difficulty. Calling Ninja Gaiden iconic as well is rather subjective and can be debated. Its early history with Nintendo started in 1988 on the NES and ended with a
butchered trilogy port on SNES in 1995 whereas Mega Man and Castlevania continued on on future Nintendo consoles. Ninja Gaiden wouldn't see an appearance on another Nintendo console until 13 years later in 2008 with Ninja Gaiden: Dragon Sword on the Nintendo DS. So popularity with Nintendo fans pretty much shifted to Xbox and, to a lesser extent, Playstation due to the series not majorly appearing on Nintendo consoles. Serious fan requests and demand for characters in Smash really picked up before the release of Super Smash Bros. Brawl in 2008, which Ninja Gaiden and Dead or Alive were still heavily associated with Xbox (thank Tomonobu Itagaki for that). Also, Ninja Gaiden has really low popularity in Japan due to the association and partial exclusivity to Xbox since the console sold rather poorly there. Now, I can see why many people point to Ryu Hayabusa's NES, classic, retro roots as a reason to include him in Smash AS A RETRO NES CHARACTER (which I hate so much) because he really didn't have many
great appearances on Nintendo consoles lately, with his last major appearance being Ninja Gaiden 3: Razor's Edge which sold on the dying Wii U...
Take note, characters don't always get in Smash due to overall (worldwide) popularity. Look at Joker, Hero, and Terry. Characters can get in due to other reasons. Sakurai just needs to see a reason to include Ninja Gaiden with Ryu Hayabusa as a playable fighter in Smash. I suppose Nintendo's great relations and collaborations with Koei Tecmo recently (Fire Emblem: Three Houses being the biggest thing right now) is what's really gonna get Ryu Hayabusa in Smash seeing as popularity is not really what's gonna cut it. Who knows, maybe Hayabusa was the most popular among Koei Tecmo's pool of characters on the Smash Ballot and Sakurai is going to answer that call...