There's at least one other Hotlife species, but they're not intelligent - or not by the Starborn's definitions, anyway. A small lifeform evolved in a 'cool' red giant star, comparable in some ways to a Terran virus. Like the SB, the 'Hotbugs' can be described as having both crystalline and holographic qualities. But the Hotbug's timescale is very different. A Hotbug will go from 'seed' to dissolution in a few years. While in its growth phase, the Hotbug expands very rapidly, incorporating any passing atomic particle that fits its matrix. When a SB comes in contact a growing Hotbug, the 'Bug starts to capture parts of the SB. Initially, the captured parts are such a small part of the SB that the theft isn't noticed. By the time a Hotbug is at the end of its lifecycle, the SB can have a small but noticeable chunk removed. The net effect on the SB (due to their holographic nature) is a general but slight lessening of its memory and powers of mind. Fortunately for the SB, the 'Bugs are most comfortable in 'cool' red stars and the SB themselves prefer hotter stars – like Sol or Capella – so there's not much contact between the two species. Unfortunately
for the SB, their initial unknowing contact allowed the 'Bugs to hitch rides to many other stars before the SB realized what they were and their danger. Even now, a 'Bug seed can ride unnoticed with a SB, waiting for the proper conditions to grow.
And, no, you're not going to see a Hotbug piloting a fighter in MG.