A weight of ~1.0 is recommended (You might want to adjust the weight depending on your model). Feel free to experiment with other weights and share your results if you want to!
The main prompt is "NyatashaNyanners, cat ears". You can add "cat tail" if you want to. Just keep in mind sd is not great with tails. Use either "short hair" or "long hair, twintails" for her most used hair styles.
For her outfits try the following prompts: Base: "NyannersBase, cat ears, hoodie, long sleeves, camisole, cat print, white skirt, cat ear legwear, asymmetrical legwear"
Commander Cat: "CommanderCat, cat ears, eyepatch, beret, military uniform, black fur-trimmed cape, black thighhighs, garter straps"
Halloween: "NyannersHalloween, cat ears, twintails, hair flower, black dress, lantern, black capelet, bandaged leg, boots"
2022 Version: "Nyanners2022, twintails, cat ears, hair bow, black dress, sleeveless dress, cleavage cutout, black thighhighs"
Winter: "NyannersWinter, cat ears, fur hat, winter clothes, fur-trimmed dress, fur-trimmed capelet, cat ear legwear, asymmetrical legwear"
Let me know if you have any issues.