First time training characters... Use below guidelines.

Main trigger:
##malfoid## -> the character should produce default hairstyle with blonde hair
earrrings -> will produce the hoop earrings
hogwarts school uniform -> will produce the uniform, use trigger like no coat and/or no jacket or combine them with other trigger. Look at example image.

Helper trigger (I don't really pay attention when captioning them):
green nails -> if it doesn't already do that
mesugaki or mesugaki pose -> for the variant that has nagotoro aesthetic

Samplers: er_sde + simple schedule with cfg of 6, lora strength of ~0.75