So kinda like this situation?
As for me, I was actually surprisingly detached from Touhou until recently. For the longest time, all I knew about it was GaMetal did a cover of Nuclear Fusion and a mashup of the latter with Bagan's theme from Super Godzilla (Toho and Touhou, huh...). I first got into it because RichaadEB did a cover of Bad Apple, followed by me finding out he did and entire album of it, and down the rabbit hole I went.
Now I'm just gonna imagine how many people in the Smash community are gonna realize they've been Touhou fans this entire time and didn't know it if Reimu gets revealed. It's gonna be like this:
Day of reveal: "What!? I never asked for Reimu, this reveal sucks! Boo! I want a refund, Suck-urai!"
Hour 1 after the reveal: "I need to watch Cirno's Perfect Math Class so I can calm myself down after that bullcrap reveal...wait...is that Reimu???"
Hour 2 after the reveal: "Right...I'll just go and listen to Bad Apple then...hold the hell up, there's Reimu again!!!"
Hour 3 after the reveal: "Okay...third time has to be the charm here, I'll just watch that Rampaging Sakuya video-OH SONUVA-!!! Okay, that's it! I'm getting to the bottom of this! Why the heck is Reimu popping up in everything now?! Am I crazy!?"
Hour 4 after the reveal: "Wow...that's a lot of Touhou...Reimu is everywhere..."
Hour 5 after the reveal: "*Crying tears of paranoia* What the hell has been my life up to this point...? Everything I've ever grown up with has been Touhou..."
Hour 6 after the reveal: "*Tears starting to dry up* You know what...I guess I'll try and take a better look at this "Touhou" thing..."
Hour 7 after the reveal: "Huh. That was an eventful trip. Touhou is a very interesting world."
Hour 8 after the reveal: "You know what? OK. I'm legitimately fine with Reimu being in Smash Bros now. Looking forward to playing as her."