Prometheus was *this* close to being playable in Mega Man X DiVE, according to the dev team. And while DLC for the Offline Version remains largely up in the air, that didn't stop the modding community from making magic happen.
That's right -- Prometheus is now a fully-fledged playable character! He comes with his own unique voice lines, skills, attacks, and key artwork. Just by watching the trailer above, you'd struggle to tell he isn't an official addition. That says a lot about how much care went into this guy, on behalf of the mod team.
To add Prometheus to your roster, simply download the mod from NexusMods. Make sure to read the install instructions carefully, and download all the necessary plugins. That said, enjoy! A big congratulations to the team for making this happen!