2 results for "fc8784c7163ecf7b33562c5834ecea99"
>>49801848
>>49802398
You have no clue what you're talking about, or you only know about the western part of the fandom, who are more perpetual Touhou 6-8 fags than even the Japanese.
The beast mafia trio are quite popular, especially for newhus. People are for some reason making a decent amount of MMDs about Saki. It probably doesn't help that one of the most popular Touhou fanartists is a big SakixMiko fan.
Of course, Keiki and Mayumi are part of that discussion as well. 17 and Animal Hell in general have garnered pretty positive receptions overall. Okina is also decently popular in the jp fandom, being basically modern Yukari. Aunn isn't doing so bad either. Everyone I've mentioned so far, by the way, has more fanart in Pixiv than Megumu.
You, like a lot of people, mistakenly think on the idea of "why is a character that's a few years old doesn't have as much fancontent as a character that's 20 years old?". It's kind of a self-answering question.
It just doesn't happen on sufficiently old franchises, with the only exception if a new entry manages to strike through a new demographic it didn't have before. It's extremely rare a character introduced in an old franchise immediately replaces an existing fan's already favorite characters in his mind.
I'll be posting some more I know later.

Some other example questions (You) could answer:
Canon (Lore):
- Character that has appeared the most in a manga (probably Reimu, but need a count)
- Character that has appeared the least in a manga/game (separately if you want). Bonus points if its made relative to the amount of time the character has been shown since she's been introduced, as some newhu would be the most obvious answer here.
- The character that has canonically lost the most
- The character that has canonically won the most (probably Reimu?)
- Character with most relations to different characters (most likely Okina)
- Character duo that has fought each other the most on-screen

Canon Game:
- The most broken, non-bugged shottype in any game (counting bugged is probably MarisaB in MoF?)
- Longest Touhou game if everything is timed out, on Lunatic (Phantasmagoria games obviously won't count) (can separate mainline and decimal games)
- Touhou singular boss appearance with the most spellcards on Lunatic (basically only counting one appearance. Not adding up, say, Yuyuko's Spellcards on PCB + TD)
- The spellcard that spews the most amount of bullets in the series, if timed out. Yes, it's nigh impossible to answer, but it is an interesting question. My best guess is Fitful Nightmare, from Remilia in ISB.
- Longest Touhou Timeout Spellcard (this one I'm almost certain is Profound Danmaku Barrier ~Phantasm, Foam, and Shadow~, from PCB via Yukari, but need confirmation)

Doujinshi:
- Circle/Artist that has made the most doujins. Separate r18 and sfw works if you want.
- Character that is part of the most amount of doujins (likely impossible to properly know as most doujins don't get scanned)
- Character that is part of the most 18+ doujins (same problem with above)
- Oldest known doujinshi
- Once (or still) 2hu doujinshi Author that has had success the most in the manga industry (probably Bkub?)