Fellow band members (and some fans) refer to him as "Alien Drum Bunny," referenced in the song "Save Us Now" from the album Mandrake. This is also the reason that his drum solo on the live album Burning Down the Opera is called the "Solitary Bunny Drum Solo."
In 2015, Felix was invited to be the drummer of melodic rock project Khymera, led by bassist/vocalist/producer Dennis Ward (Pink Cream 69, Unisonic). He recorded drums for their last album called The Grand Design.
Felix was also announced as the drummer, recording all tracks, on Avantasia's 2016 album Ghostlights.