While >>21 is (hopefully) busy composing a memorable and heartwarming soundtrack, I'll suggest this: http://daifukkat.su/files/We%20conjure%20the%20spirits%20of%20the%20computer%20with%20our%20spells%20(Extended%20%60%60Satori''%20mix).mp3
>>41
For romancing/sex scenes, making them weird and even far removed from what one could consider romance or eroticism should be part of the appeal. I don't know if you've read any of the old /prog/ kopipe but a lot of it is centered around bizzare fetishistic situations.
If you don't want to write about Touhou then someone else like me probably will, we can stitch it all together haphazardly at the end anyway. I thought what might be cool is have each character will have a parallel with another, like one SICP character will have a Touhou counterpart, etc. That might mean having to accommodate their personalities, but Touhou characters are pretty open to interpretation by nature.
If you ask me attaching names beyond the site itself goes against the spirit of an anonymous project, so I wouldn't worry about needing an 'identifiable persona'. One nice thing about IRC is you just pick a name and connect, you can just use a different one every session if you want.