the presentation is good! and here are some things I think should be corrected a bit:
1) first of all, I would change some background and characters fonts colors, for example slide #3 I feel is a bit difficult to read. Of course it depends a lot on the room and what display will be on, but I really recommend to preview it on the same room environment and make adjustments about some of the colors.
2) slide #2: you should change a little the first sentence, because Yamaha started development on Vocaloid not as an alternative for not paying artists on a hour/fee, but it was an experiment by some of Yamaha audio engineers in Tokyo while recording audio sources from their musical instruments and developing effects for their AV receiver. Official Vocaloid development started in 2000 with the Daisy name with a secret team of audio engineers in their Tokyo office, only the top level knew what the team was working on. Yamaha wanted to release the software as "Daisy" (a reference to Daisy Bell song), but then changed the name to Vocaloid. Vocaloid 2 used vocal samples, but Vocaloid 1 was based on voice analysis (something similar of Vocaloid 6).
3) for the slide #3, I would put some sample videos or more screenshots of the Vocaloid interface for each of the points
4) slide #9, Crypton characters are officially called Piapro Characters (from Piapro website of Crypton, "Peer Professional", where creators can put their works of songs, lyrics and artworks for both free and commercial use, depending of the license of each work)
5) slide #10: Miku item is spring onion ("negi" in japanese), not leek! I know many fans are confused about it, but it's spring onion, not leek.
6) still slide #10: Miku also has SP (Super Pack),Vocaloid 6 (in development, planned by end of 2025) and NT ver.2 (which is completely different from the first NT, in fact you can use the two NT voice banks together)
7) in the most popular songs of slide #10, I would put also Senbonzakura ^^
8) for Rin and Len, I feel you should tell that they are twin characters (is not clear in the points of slides #11-12), and their names are made after the R(ight) and L(eft) of audio channels of speakers and headphones
9) slide #13: Yuu Asakawa actually likes Luka, but at first wasn't interested in anime, she had a different professional background compared to the other voice providers
10) also, both Miku, Rin, Len and Luka have the kanji 音 (oto=sound) in their last names
11) for Meiko in slide #14, character items should be also red wine and red rose
Luka has pink wine as item too (and she is 20, so in Japan is at age that can drink wine). Meiko and Kaito share a similar age of around 23~25.
12) for Kaito in slide #15, you should say that his popularity grew up more and more thanks to his duet songs with Miku, Len and Meiko, and also more and more artworks together with all Piapro characters
13) Kasane Teto is missing
14) you should make a slide about companies like Pixiv, NicoNico (Dwango) and Good Smile Company, because they are all part of Vocaloid culture
15) also, write about Producers and that each of them have a very different sound signature, and that usually a Producer make the song, but then hire an artist or an animation studio for the video. Many times, the Vocaloid characters change their default outfits and hairstyles to customized ones made by the artists to suit better for the song. Some producers draw too (like LamazeP and PinocchioP), and some big producers like Deco*27 have now their own producing studio that take care of all the making of a song and album (and they make anime songs too).
16) talk about Project Diva and Project Sekai series!
and the collaboration between Crypton and Sega (with their company Marza Animation Planet) for all the concerts
17) about the Vocaloid culture, you should also tell about that every year there are in Japan (Magical Mirai) and overseas (Miku Expo) both official and fanmade concerts and events that gather tens of thousands of fans
!!
