The Fire LEO-04 "Rynex" is the main ship featured in the game Thunder Force IV as the newest model in the Fire LEO series developed by the Galaxy Federation, also known as "Vasteel Original" by the humans of Earth, and was the basis of the RVR series in Thunder Force V. Rynex can be considered the Thunder Force series' mascot, as the starfighter has appeared in a majority of the games (Thunder Force IV-VI), all of which it played a significant role in.