Nicar is a carbon world (formed from a protoplanetary disk with more carbon than oxygen, so water is geologically unstable and the chemical environment is strongly reducing) with ammonia oceans and lots of atmospheric methane.
If it were bigger, it would be a perfect world for hydrogen breathers with ammonia-solvent biochemistry. But... it's too small to retain hydrogen. Like Mars, it will lose hydrogen over time, reducing the size of its oceans and making it less habitable. Unlike Mars, however, it can never develop an oxidizing environment, but it can develop a layer of less-hydrogenated, low-weight hydrocarbons, like propane and butane, that float on ammonia and retard further evaporation.
But if life keeps doing the obvious thing, and tearing apart ammonia and methane for building blocks, releasing excess hydrogen into the atmosphere, eventually everything will dry up and the world will die, just like Mars. So, given access to liquid ammonia and propane/butane, what are reasonable reactions that life could use to construct energy-storage molecules (like sugars) and structural molecules (like lipids and polysaccharides) which will not result in releasing excess hydrogen?