I recently played a videogame with a non-binary character and wanted to affectionately refer to them as [ロワン]{Rowan}[くん]{kun} but realized that this suffix is normally applied to males.
I also found an answer mentioning that kun is normally used for males/masculine identifying people here.
Is there an alternative suffix that I could use or would [くん]{kun} still be appropriate even for non-binary people?