Since I've seen a few more Touhous since the last list, here's an updated version
SaltyBet Touhou/2HO Tier List
Broken Tier
Yukari(!), Flan(!)
Ronald Slayer/AC* Master Race tier
Aleti
Top:
Remilia (troll), Arrange Remilia, Patchouli, Tensi, Marisa
Really Good
Suika, Iku, Saisyuu Dokusyu Bouei System, Acirno 3.5
Good:
Yuuka, Minoriko, Shizuha, Team Reimisen, Nazrin, Kanako
Average:
Sanae, Mugetsu, Yamame, Meirin, Rumia, Shikieki Yamaxanadu
Crap/Touhou is reclining/ZUN Art Tier:
Namazu, Suwako, Letty, Reisen II, Alice, Mamizou, Syou, Murasa, Reisen Deadpool Inaba, Kisume, Mystia
???:
Nue, Cirno, Achi Cirno (alt fire Cirno), Yukari, Shanghai, Satori, Mokou, Ran, Lunasa Prismriver, Hatate, Aya, Mima, Giant Suika, Momiji, Kogasa, Aya, Chen, Daiyousei, Kokoro, Ichirin, Hanyuu, Hopeless Masquerade 2HOs, pretty much any character not already mentioned on this list:
http://network.mugenguild.com/guild/mugenwiki_toh.html
*AC = Advent Cirno
NOTES:
???
Some of these characters I've seen before but not enough to decide what spot they'd be on (lost too badly or won too easily). The rest of them I've never seen in action and don't know whether they actually are in SaltyBet or not.
AC Master Race/Advent Cirno 2HOs
Basically a special set of Touhous based on fan manga series called Advent Cirno (that is in itself a hybrid of Final Fantasy 7 and Touhou). They are really really good and aggressive rushdown unlike most of the Touhou characters are.
Toku/IMaMP/SWR 2HOs
The most common set of Touhou characters. They are all set after the characters in the official fighting games.
Hopeless Masquerade 2HOs
A new type of Touhou that, may not be in Salty Bet but will list anyway. Basically HM is a fighting game spinoff in 2HO that differentiates itself from the past fighters by having all of the fighting take place in the air (no ground movesets only flight mode). We don't know whether they will catch on as a new standard for Touhou characters but there are already a few HM 2HO's in the wild that some might show up in SaltyBet.
Giant Suika
Special version of Suika with no blocking and a huge hitbox but is also but immune to grabs
Saisyuu Dokusyu Bouei System
Don't be fooled, this is definitely a Touhou character.
Reisen and Reisen II
Refer to diagram below. Reisen II is only called "Reisen" in-game, and Reisen Udonge Inaba is Reisen SWR.
Team Reimisen
A team of 3 full health characters (Reimu, Reisen and Marisa) that can switch out at any time. They are just as annoying as you'd expect them to be. That said, they function as a tag team; if one member dies then it counts as a loss. Aggressive or combo centric characters do really well against them because of this weakness.
Yukari(!)
Has ridiculous damage and a unique sprite different from the official Touhou fighting games. She looks like the alternate Yukari on the link with the list of Touhou characters, except with a weird aura surrounding her. Hard to say how well she would do against other broken characters though. There is no ! on her onscreen name
Reisen Deadpool Inaba
A bootleg version of Inaba with Deadpool's voice from Marvel vs. Capcom 3. Unless it's an Extreme Potato Fight™ and she's fighting an opponent that's about on her level, don't bet on her
Hanyuu
She's a bootleg recolored version of a Touhou character that for some reason uses a sword, has a steamroller super and goes saiyan(?). I don't really know what to say. She could be a joke version of Akyuu since we do have misspelt 2HOs like Mugetu and Syou.
Flan(!)
Just like most popular Touhous, there are several versions of Flandre. This particular one is like Yukari(!): special sprite and ridiculous damage. Also no ! in her onscreen name.
Also generally speaking, most Touhous are zoning characters. There are exceptions like the Advent Cirno Touhous, the Aki sisters (Shizuha) and Ichirin.