Tiki's appearance from Fire Emblem 1, 3, 11, and 12.
Weights around .5 to .7 work well. Higher then .7 seems to overwrite the model's style more then I personally prefer, so keep that in mind while prompting.
For her default outfit, use "short dress, pink dress, tiara, pink scarf"
For her FEH swimsuit, use "pink one-piece swimsuit". The model doesn't seem to understand exactly what it is, but it gets pretty close.