French GTS : Malinella (Patreon)

Malinella is the niece of Mélusine and Mélisande, a 114-year-old teenager who likes to sow chaos and destruction in her wake.
She first appears in volume 15 of Mélusine, l'apprentie sorcière.
Mélusine finds herself obliged to look after her disruptive niece, who has no respect for anyone.
This drawing picks up on one of the gags in volume 15, where Malinella can't stand being treated like a kid and, in a fit of pique, spills a potion on herself that makes her shrink.
Here it's an alternative version where she grows up, which doesn't suit Mélusine very much, nor Mélisande, who prefers to hide from this green-haired monster.

"So who's the tallest now, Auntie?"