Shionne Imeris
Onshi
i feel like this, yeah although most of the 98 era canon is much less cohesive and often MUCH less detailed than any of windows eraYeah, that has to be a bigger change. They almost look like completely different characters once making the transition from PC-98 to the Windows era. As if the whole series got rebooted or something... Is that why people suppose the two of them were age 10 at the time of EoSD (or was that during the PC-98 canon era)?
there's a lot of fanon theories why this and why that though but barely any info about 98 era is confirmed by ZUN
although first thing is 98 games were much more brutal than windows games because spell cards rules didn't exist back then so i suppose lot of fights were to death or severe injuries
second: lot of 98 characters were specific to their game only and made appearance only once and never again (this is especially true about whole HRtP cast aside from Mima)
i heard a lot of fanon theories that after events from MS and young alice fight (essentialy last fight in the era since shes extra stage boss) she opened/used her grimoire somehow which caused some kind of catastrophe, space rift or whatever which only Alice, Marisa, Reimu and Yuuka survived (especially considering windows alice does hold a grimoire that's never supposed to be opened which iirc marisa tried to do/ask about once)
Reimu in 98 era is also smaller (i think) and so is Marisa and Yuuka also changed (hairstyle and eyes color)
also remember that HRtP bad ending was literally whole planed exploding (both endings with slight differences iirc) and one of SoEW bad endings was marisa literally crucifying reimu as part of her "training"
(ZUN made her looking like a kid since Touhou 2 though...)