So? If it's so incredibly difficult to be able to bring a mass amount of random characters back that had zero background or significance to begin with, why would you even want to bring them back in the first place?
Why would I bother bringing them back? Simple answer: To satiate their Fan Base. We all know many people want to see some PC-98 characters back, something that proves this affirmation are youtube videos about their themes. If you go to something like a vid about ellen, you?ll see among the comments stuff like ?Ellen is my fav PC-98 char, I want her back T_T? or a Meira vid: ?She is such an intriguing char with an awesome theme, I want her back!? Mima is the best example, there are loads of comments like ?MIMAAAAAAAAAAA!!! TwT? And the same could apply to all characters, because there will be always someone to love them. So, why not attending their wishes? I think it?s kind of cruel the sensation of knowing they will never be back. And it?s not exactly me that wants them back, as I mentioned before, I still prefer new characters instead, but I know some people don?t think this way. As such, I think it would not hurt to see Zun concretizing their desires somehow.
As I mentioned and as you seem to have missed, take a look at all of these examples. StB and DS? They're all using characters that have been introduced previously and already are fleshed out. Hatate is an exception as a new character, but is immediately given relevance and background. The same goes for GFW, but the biggest difference is that ZUN uses Daiyousei, a character with no background. However, EoSD shows that she actually exists in Windows Gensokyo, she has a connection with Cirno, is also a fairy, and fans have already turned her into a semi-relevant character. For a similar reason that Momiji was fleshed out in DS, Daiyousei was given another appearance. None of these are really applicable to many PC98 characters, although I could think of a few. Tales is the same way; all the cameos are fleshed-out characters from previous games, even though they aren't relevant to the current game. Tales series and Touhou are completely different, in any case, so using Tales as a standard for what Touhou should do is a bit off.
I don?t agree with your point that this isn?t applicable for many PC-98 characters, so I consider your argument to be invalid. I could say a character like sara has more relevance than someone like Daiyousei, because as useless and without background as she is, she is still the Gatekeeper of Makai. She has a purpose to exist, and that purpose is fulfilling her role as a Gatekeeper to prevent intruders in Makai. I could say the same for another useless character: Louise. Even though she has no development, she had a purpose to fight the player character, she wanted to visit gensokyo, player character got into the path and didn?t agree with her attitude, so, she fought for her ideal in order to accomplish it. She wasn?t like ?I want to fight! Fight me now!? No, as I said, she had a purpose to fight. Meira is another example, she was greedy and wanted the power of hakurei for herself, so , she fought Reimu. Now, what about Daiyousei? She just attacked the heroine on EoSD stage 2 out of nowhere without even exchanging dialogue (Same case occurred on GFW) and we still don?t know why the hell she did that. Now why do you say a character like her is more ?fleshed out? than those previously mentioned PC-98 characters? because she is related to another equally useless character such as cirno? because she is on windows and has a more beautiful sprite? Seriously, give me a break. What makes a character ?fleshed out? or not, isn?t the fact that said character is on windows or PC-98, and if a character like Daiyousei is moderately popular, it?s due to fandom, and not canon, because fandom generally attributes a background even to silly and purposeless characters. One of the things that would explain characters like Daiyousei or Koakuma?s popularity, is the fact that those characters are on EoSD which is among the most popular touhou games, and not because they are important/relevant or whatsoever.
Er, you're missing the point, as DesuCake explained above. Also, what happened to my "Once EoSD hit, while characters didn't really need a reason to exist (Rumia, Letty, Alice, mostly everyone) they're still there because they're bound to the world and they're equally bound to the world because they're in the game."? The whole reason ZUN didn't bring many PC98 characters over in the first place was because they largely had no background, no relevance to anything, absolutely nothing at all to get them to all work fluidly together or reason to be brought back. The reason is they aren't here right now is exactly because he thinks they shouldn't have been thrown in so haphazardly. The standard was set immediately as the Windows series started, as even the completely inane, random characters have relevance to Gensokyo as a whole.
Well, unless if you make it more clear, then yes. I?m missing the point and I don?t think I?ll ever get your point. Because characters like Letty or Wriggle or Mystia, are as inane and random as most of the PC-98 ones, regardless of how much literary works/spin offs or whatever they got in. And although most of the PC-98 cast is inane, they still HAVE relevance to Gensokyo, because they make part of Gensokyo?s universe. I could swear if Alice was never brought back by Zun, everyone would say ?No, she will never come back, she has no relevance to gensokyo, blah blah blah? And nowadays she is one of the most popular among touhou cast. So, I disagree with you. The older characters should not be looked down upon, because it was still Zun?s works, even though it was his first works.
Which might as well be purposeless, imo. The only attachment they have to the series at all is "they were in a game", which by itself is pretty empty. You could use that argument for almost anything: I want a banana character because I want to see their danmaku. The banana character would provide just as much previous world relevance as Sara, has an equal capacity for exploration and an equal chance for danmaku. But, the banana is new and Sara isn't. That's pretty much the only difference I can see.
Which is something that bothers me. Back in the NES times (which was one the consoles I grew up with) most, and really MOST of the games had particularly not really interesting stories, but they were just as fun (and even more fun, imo) as the newer games. Back in the past the bosses, enemies, had particularly zero background or development. They were simply there. To get into the path of the player character and prevent him/her from going further. Despite how silly those games were, they still sold a lot and got a place into the hearts of many people (I was one among them). What I?m trying to say is that I see the PC-98 cast the same way. But nowadays people are trying to give relevance/background/development/backstory/depth/etc even to a Banana. Which isn?t something really fundamental imo. If I want a really good story, then I go watch a soap opera or read a novel book or something of the sort. If you ask me, good story ≠ fun.
But if you insist, then I could make some alterations, instead of ?Coliseum Mode? we could have something like ?Random Lesser Confrontations In Gensokyo? so, instead of throwing random fights inside an arena, the characters would rather have an actual purpose to fight. But to diminish work and effort, we could just have the boss battle without a stage. Every character would be given an excuse to fight, and I can give some examples:
Rika?I spent years creating this machine, and now I?m going to prove you that science is superior than magic, you bitch!? As such, she creates a new machine/tank/battleship/whatever that is like 10x stronger than evil eye sigma, and then we fight her in a difficulty level equal to a phantasm boss.
MeiraThat would be simple, another attempt to get the power of Hakurei. But this time she is a Kensei (Sword?s Saint) and has mastered several sword techniques, making her far stronger than before.
SaraReimu decides to close and seal makai?s gate for once to prevent possible invasions in the future. Needless to say, Sara is against it. And then she fights in order to defend the Gate. (Only Reimu can be used against her)
EllyYuuka is sick and the only cure for her disease is a Magic Mushroom Tea that can only be made with the right ingredients (Mushrooms from the Forest of Magic) Since Yuuka is so sick and unable to fight or walk properly, she sends Elly in order to gather the ingredients and cure her. But Marisa sees the familiar face getting mushrooms there, and since she is so selfish to the point of wanting all of the mushrooms to help her making magical recipes, she puts a fight against Yuuka?s minion. (Only marisa can be used)
YumekoA perfect maid contest is taking place in gensokyo, all of the maids are gathering there to win the Title and prize. Sakuya and Yumeko are the finalists, and the final test is a danmaku fight. (Sakuya only)
Are you happy now? I could think of many other examples, everyone else could as well. The only thing required is imagination. And before you say ?Those excuses are still stupid? then, explain Alice. (I?m going to quote her official words on PCB to explain what I mean)
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Reimu: The night is cold. It's also when my eyesight is the worst.
Alice: Is even the warmth of your spring insufficient for pushing away this cold?
Reimu: Yeah, I guess it's not.
Alice: Long time no see.
Reimu: We've only just met.
Alice: No, that's not what I meant.
Reimu: Am I supposed to remember?
Alice: Don't you remember me? Well, either way is fine.
Reimu: Setting that aside, what did you mean by "the warmth of my spring"?
Alice: I was referring to a degree of spring in your mind.
Reimu: I wish mine's doesn't reach too high. Still, why has this winter been so long?
Alice: Because there's someone who's gathering spring.
Reimu: And you have nothing to do with it?
Alice: Of course not.
Reimu: Bye.
Alice: Hey!
Alice: >>> At last, former friend, we meet again. Have you only brought me your life as a gift? <<<Reimu: I won't be called "former friend" by a fool who plays around with seven-colored magic.
Alice: After all shrine maiden, your two-colored powers are a mere twenty-eight-point-five-seven-one-four percent as powerful as mine.
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As you can see, she only fought Reimu out of revenge, and that was enough to bring her back. If you consider this silly excuse to be good enough to include her on windows cast, then the silly excuses I pointed out for those characters are good enough as well.