Even more ideas for bases:
* With Sean and Dan, SF2-styled sheets already exist for them on DeviantArt.
https://orig00.deviantart.net/9959/f/2016/187/f/4/sprite_dan_hibiki_super_street_fighter_2_by_luis_mortalkombat14-da6ij31.png https://luis-mortalkombat14.deviantart.com/art/Sprite-Sean-Matsuda-Super-Street-Fighter-2-620466670
* Allen Snider, Kairi, Kage, and Oni can be constructed from the shoto base as well, leaving only Sakura, who could easily use Kisarah from AODK as a base, which can be used again for Karin and Ingrid, not to mention Hinata from Rival Schools, and Garuda, who could use perhaps Muramasa from Knights of the Round or at least his head. With Ingrid, I also see Sailor Moon from the Banpresto games working. Carol Stanzack could be used too.
* Rashid could use the head and legs of Maherl from Breakers, with the rest of his body perhaps being from Titanic Tim. Sahad from Power Instinct Legends would work too.
* Blair Dame could perhaps use Widow from Slam Masters as a base. Or Silbia from The Great Fighter, who also wouldn't make a half-bad Laura Matsuda. Or Madiesha from Tough Guy.
* Sawada could be based on Fei-Long, with Guile's legs.
* The Dolls, like the Shotos, should be easy edits of Cammy. Like Menat, I plan on doing a set of each of the dolls and then some. For example, Lita Luwanda could finally get made playable, GX-9 from the RPG, Celia from the 1995 show, etc.
* Hokuto could use Geese’s legs. Maybe a scaled-up Rei from Tuff E Nuff? Tsugumi from Dragoon Might, as well as Mizuki Rashoujin, could also work.
* Shotoborg could be a nice starting point for the Bison Troopers.
* Bullet from Super Fighter could be enlarged into Ed. Would Red Man from the same game work for Necali?
* Perhaps Neo-Dio could be the base of Gill?
* F.A.N.G. could be edited from the Chinese vampire from Martial Champion.
* Alison from Invincible could be a base for Falke, with Blue Mary’s head.
* Makoto could be based on Ryoko Kano.
* Oro could be based on Rogeunja from Violent Vengeance.
* Raven, a scrapped character from the movie game, could be based on both Frank from Super Fighter and Hassarn from The Great Fighter
* Speaking of The Great Fighter, Sasaki and Dennis seem like the best bases for Zubaz. Though Akira, Gill, and Mark from Karate Blazers don't seem half bad either.
* Violent Storm's Lisa could be used for Cantana.
* La Lupa from the TV show could be based on the Amazoness from Denjin Makai. Or again on Slam Masters's Widow. Or Palmera from Mutant DNA.
* Palmera also seems like a good base for Satin/Saturn Hammer.
* Geegus from World Heroes could make a base for Seth, combined with Khrome from Shadow Fighter.
* T-17 could work for Kevin Stryker.
* Cheng Sinzan could be used for Rufus.
* Joe from AODK could be used for Batsu.
* Hyuck from The Great Fighter could be used for Shin, together with Jaw from Tough Guy, Wade & Kyle from Violent Storm, and Leonhalt from AODK.
* Hyuck could also be combined with Vega and Jean to make Remy.
* P-Belva (and the original Belva, and maybe even Steven from Street Combat) = Kevin Stryker.
* Skullomania could be made out of a Genesis Power Ranger. SNES Captain America could use parts from that, and Genesis Magneto's cape, to be converted into Shadowgeist. Ultraman may work better for Shadowgeist's head, though.
* VFG's Shaia and Karin have legs that would work for Rose.
* Kyle Travers could be edited from his brother Cody. Perhaps Kyle from Violent Storm could work? Same with Joe and Mike, or... Axel and Adam could be used, and then there’s their stunt doubles Scott and Max.
* Gekkou from Kaizer Knuckle could be turned into Geki, and maybe be partially used for Ibuki. Maybe his legs could be used for Goutetsu? And also his legs could be used to make Sarai.
* Kisarah also has animations that remind me a bit of R. Mika.
* Shotoborg can be turned into Cycloid Beta, and perhaps with elements of Khrome from Shadow Fighter. Cycloid Gamma would be harder, though, due to its odd design.
* One of R.A.X.’s arms could be used for Area.
* Could Arabian Moon from Superior Soldiers be used for Pullum Puruna?
* Maybe Trident could work for Urien. Or Burnie from Alien Challene after taking off his flames (who does look a little more like Seth, though Stevareno from the same game might work better for Seth due to his shiny liquid body)
* Wong Fei Huang From Alien Challenge could be edited into Lee.
* Kaiser Knuckle’s Wu Long could be a decent Yang or Yun.
* Reiji Oyama could be a base for Goutetsu's upper body.
* Junior from Body Blows might work for Dudley.
* Hayate could be based on Haohmaru.
* Yungmie might be a good base for Laura. Or Maria from Body Blows.
* Madiesha from Tough Guy might work for Elena's base.
* Violent Storm's Kyle could be used for Charlie Nash.
* Gonzalez from Kaiser Knuckle would make a decent King Cobra. If Makoto ends up using an attack where she summons her father's spirit, that would work well for him too.
* Shoujo Tora from the RPG could be based on Genesis Cheetah.
* Wacker from Tough Guy would work for Q, maybe a little Larcen Tyler as well.
* C. Viper could be based on Jetta Maxx. Perhaps Riptide as well, and Miyuki from Fight Fever.
* FF3-era Terry could become Cracker Jack.
* Biff Slamkovitch and Gunloc could of course be used for Alex. El Stinger and Astro from the same game for El Fuerte. Alternatively, Terry Rogers from 3 Count Bout could work as Alex.
* Yamato, Mika's partner, could again use Madiesha from Tough Guy.
* Shon Ray from Mutant DNA could be used for The Warrior King.
* By far the best Adon base is Hwa Jai. Shura seems more appropriate as a base for Somsak from Makoto's SF3 ending. Samchay would be good for Hu, a member of the Shadow Fist group from the RPG (probably also using Shura's head)
* Pulk Hogen (minor SF3 character) could be based on Gochack Bigbomb from 3 Count Bout. Maybe the head of Hawk from Best of Best?
* Lola from Dangerous Streets could be made into Lady Death, another Shadow Fist member.
* One of the sumo fighters from Battle K Road could be used for the RPG-only fighter Bluegrass.
* The proportions of Joe from Violent Storm remind me quite a bit of Necro and Twelve... The latter might even be able to take cues from Huge Frogger from King of the Monsters 2.
* Hakuyo seems like a good starting point for Yang.
* Yun could easily use Skate’s head.
* Mess O' Bradovich could be combined with elements of the protagonist of Riot City to make Anvil from the RPG.
* Kolin could use Jetta Maxx’s head, the coat of Wacker from Tough Guy, and the legs of say... Madeisha from Tough Guy or Rachel from Martial Champion.
* Diokles from Blandia seems like a good base for Alexander from the RPG
And also, I found some interesting examples.
EDIT: Menat now has a portrait, thanks to me.
Edit: And Cantana has joined her.
Also, any sprite-based character can be done via devamps of the original sprites.