The Andromeda Incident by R

This sci-fi fantasy gives a whole new meaning to the word “Galacti-sexual.” Emrys Myrddin Calyx was born aboard the Starship Americus to a weak-willed and somewhat frail Earthling father and a black panther-like humanoid, Myrrddissian mother. Emrys was created experimentally to be double-sexed, and can change sexes at will, via a telepathic command.
The Andromeda Incident (or Out of Chaos Comes Hope!) tells all about the mixed-up life Emrys lives, and his adventures and misadventures in the 12th. and 21st. centuries.
Wander the universe with Emrys as he uses a time/space continuum device to journey to the devastated planets of Mars and Earth, just before both human and alien-caused cataclysmic events occur. This startling adventure was 900 years in the making!