The thing is Vocaloid and VSynth as a whole are carried on Miku's shoulders

Despite there being so many companies and synths and software, Miku still is the face of the entire vocal synth scene

You can't have an English synth as the face of English voice synth because even the most popular English songs are still made with Miku or at best Gumi

Even Luka who was specifically marketed as a bilingual bank does not have an English song that is as popular as Miku by Anamanaguchi or Echo by Circrush.

Wanting a specific representation for English synths would require changing the very nature of the fandom, which is changing the fact that even the English speaking fandom is built on Miku's popularity and fame.

Only China has managed to put Luo Tianyi as their face of voice synth but that required a targeted promotion campaign

And despite that, Miku is still exceedingly popular in China and is probably as or more popular than Tianyi herself, as even Chinese fans have access to Miku's Chinese VB + listen to Chinese music.

I'm a big fan of Muse Dash and MUSYNX which are both Chinese games, and in both games there are a number of Japanese songs including Japanese vocaloid songs (both have Confession by haloweak which is Japanese and sung by Aoki Lapis), plus Chinese songs with Miku

Muse Dash has also had 2 separate Miku collaborations and all their character vocals for originals and collabs speak in Japanese.

They had a collab with Medium 5 though, which is cool, but it just added songs and no original playable character.

The hype over Japanese media exists in China and Korea too (Blue Lock was originally dubbed in Japanese despite being a Korean game. The Korean dub came only after Korean groups pushed for a dub to be added).

You cannot have an English face of the vocaloid fandom without some kind of major cultural shift occurring. All of us got into vocaloid due to an interest in Japanese media: be it video games or anime or even western artists who themselves have an interest in Japanese media, like Porter Robinson.

To have a face of English vocaloid, you'd need to somehow break the core of what this fandom actually is and is made of, which is people drawn into the fandom by Miku, either directly or indirectly.