Anything like nano banana in terms of quality that can run locally?

Nano Banana is still at the top of the class but there are two fairly decent image editor style models that you can run locally - Qwen Edit 20b [1] and Kontext Dev [2].

[1] https://docs.comfy.org/tutorials/image/qwen/qwen-image-edit

[2] https://docs.comfy.org/tutorials/flux/flux-1-kontext-dev