Trigger word is advt.
Use 'dot eyes' tag for the specific eyes style.
You might want to use 'flat colors' tag in some cases.
Trained on a whole lot of screencaps.
Hair trigger words: leaf hair, water hair, flame hair, shaved hair, rough hair.
Main characters hairstyles change throughout the show. This model should handle most of them fairly well.
Character list:
Princess Bubblegum: bbgm, pink skin, pink hair, long hair, tiara
Marceline: mrln, grey skin, black hair, long hair, pointy ears, fangs, neck mark //'neck mark' tag might produce weird results
Flame Princess: flmp, orange skin, flame hair, forehead jewel
Huntress Wizard: hswz, green skin, green sclera, slit pupils, green hair, leaf hair, antlers, domino mask
Betty: btty, brown hair, glasses, headscarf, hat
Doctor Princess: dctp, green skin, brown hair, twintails, glasses, tiara
Canyon: cnyn, blue skin, green eyes, aqua hair, long hair, ponytail, pointy ears, headband, forehead mark
Minerva: mnrv, blonde hair, short hair, hat
Bronwyn: brnv, yellow skin, large eyes, blonde hair
Bandit Princess: bdtp, white skin, green sclera, slit pupils, grey hair, shaved hair, horns, pointy ears, crooked nose, sharp teeth
Lady Rainicorn: ldrc, unicorn, feral, horn, furry, large eyes, rainbow fur, blonde hair, long hair //produces mixed results
Enjoy!