I’d be surprised to find hydrazine in any significant amounts anywhere in nature. It’s unstable, because nitrogen really wants to be N[sub]2[/sub]. You don’t even need anything in particular to react with it, though I’m sure there are some substances that catalyze the decomposition.
At least in the ammonia clouds of Jupiter it is theorized that hydrazine is also present : [PDF] 5 Jovian Clouds and Haze | Semantic Scholar
I think I may have read that it was on Saturn too.
Hydrazine can be found in small quantities in the tobacco plant, hypothesized to be an intermediate step for nitrogen fixation. I would agree that there is unlikely to be any kind of equilibrium reaction that would produce more than trace amounts of hydrazine, but it could serve as an energy storage mechanism for some really self-organizing non-equilibrium system which developed in an energetic, ammonia-rich environment like a “Hot Neptune” type of planet.
Stranger
Which one?