OK. Let me answer some of these wonderful replies I'm getting here.
First of all, Esteban, I'll paste the response I put on youtube, then also respond to your additions.
(2) He seems to be the PC-88 mascot used in the late 80's. He appears in a lot of ads for the PC-8801FE and PC-8801MC, which is why I used him in this video. Yeah, having a mascot to sell products was pretty popular in Japan through the 80's and 90's. It still is for some products.
(3) Sound effects were from Popful Mail for PC-88. Build up music is Legend of Heroes II, "Fanfare" music is Pyramid Sorcerian for PC-88VA.
(4) Unless there's some really weird key combination that needs to be pressed, the background doesn't seem to be changeable.
(5) No idea. Media Center seems like a good guess.
And on your "tangent rant", I agree completely. I am definitely in the "recapturing the experience" camp. Having original hardware and software is the most important to me. Having them in perfect condition is not a top priority at all. As long as it works, it feels genuine enough to me. Sure, you could argue that if I'd used this system back when it was newer it would not look all yellowed like it does now, but I would still say that having original and working hardware/software is still the most important to me, not pristine condition ones.
(6) Yes I am planning to make more. I have at least a few more PC-88 vids planned for the near future.
I remember vaguely that the Game Preservation Society had a uber rare PC88MC CD game... doesn't seem like the CD option was popular at all, or at least that's the impression I have given the # of CD games... do you know how many floppy games use CD audio as a bonus?
loosely related tangent: Nobunaga's Ambition on the PC Engine uses chiptunes but weirdly has beautiful orchestra renditions of the classic themes on the very same CD. I wonder if there's a version of the game for the PC88 that can play the music off the PC Engine disc haha.
The "uber rare" PC-8801 CD game is probably "Dios". I'd love to get my hands on that one too. I own the other game "Mirrors", which is not as hard to find.
I can't give an exact number of floppy games that use CD music. Most Falcom and Koei games from the very late 80's and on do. The Falcom games I believe are Legend of Heroes 1 and 2 and Popful Mail. That might be all of them. I think there were at least 4 or 5 Koei games. No idea on why Nobunaga's Ambition for PCE contains the soundtrack. The Koei games are all designed to use the official "Soundware" CD's released by Koei. Unlike the Falcom titles, you can't adjust which tracks play for which parts of the game, so you have to use the official music CDs.
I can't believe you don't know this guy: https://en.m.wikipedia.org/wiki/Susumu_Matsushita
Thanks. Didn't realize he was drawn by the same guy. Still wonder if the PC-8801 mascot guy had a name or anything. I presume he probably did, at least internally.
I'd seen that little furry guy before on a music CD:
http://vgmdb.net/album/10427
That music CD was originally included with this PC. Look on the bottom left of the cover. "PC-8801MC".