If you are using base anima you may want to add a lora or an artist to control the style, if not is gonna have a wide range of results.

IF you have any doubt about how to use tags on anima check my guide:

Anima prompting (Natural + Tags) with LORA | Tensor.Art | Tensor.Art

Saber: aqua eyes, grey hair, ponytail, cropped jacket, tube top, bike shorts

Lancer: grey hair, aqua eyes, long hair, braid, black ribbon, hat, black dress, frills