There are three formats: loha, locon, and full checkpoint
The first two are part of the LyCORIS project and can be used as lora in a1111-webui once this extension is installed
You probably want to separate names by ; as this is how the model is trained. E.g.
Sabine; YamanoMitsuha; multiple girls, 2girls, bow, sliding doors, apron, dress, indoors, holding, bowtie, smile, open door, door
As usual, two characters are fine, but more are difficult
