Jessica is an original Incineroar character created by Zourik, she mentioned in the story Parental Advice

[...] When he (Michael) had gotten married, his wife loved to make him [...] - A Part of the Parental Advice story mentioning her

However, the mother makes other appearances in the comics:

• Family Bonds (She is still shown as a Torracat)
• Time to Grow (She shown in full)
• and Family Memories

Jessica is a female Incineroar, she has a black face and her hair, eyebrows, and nose are red. Her long hair and tail are red and black...
Her eyes are violet with yellow sclera.

She is Michael's ex-wife and Allan and Dylan's mother.