Here's a wonderful reference work for Scarlet's partner in my Natural Disaster work. Always love seeing characters gain even more life visually! This is useful for any illustrative pictures I get too. Plus she's a little complex.

Spoilers below.

Tess, last name Zerra, is Scarlet's companion. She's the inventor of the micromachines used to grow Scarlet for Operation Big Pink. Frequently overlooked and not taken seriously while working at the Air and Space Center, she tried to prove her worth by injecting herself with them, resulting in her losing her arm.

Tess saves Scarlet, or Big Pink, from being caught by Grand Technologies to experiment on her and control her after the volcano mission. The two of them work together to create a way to overcome Scarlet's inherent weakness and return her to normal. However, when Tess sees Big Pink's incredible power firsthand, she tries to take control of her and exploit her for herself, including by lying to Scarlet about what happened to her arm to take out her bully. Scarlet eventually finds out what she's up to and basically harshly kicks her ass then leaves her, only to be caught by the company. Tess makes up for it, though, by rescuing her one more time. She loses her prosthetic arm in the process, eventually getting a new one later. In the end, the two of them remain friends who basically live together at her hideout.

Little Fen, as Scarlet calls her, has a personally designed jetpack she uses to fly around and generally always wears her goggles and flight suit to go with it. Basically, always resourceful and usually encouraging, Tess is the giantess's second half.