That's not Tessa...

In "Mass Destruction", it is revealed that the Solver killed Tessa and later grafted her corpse onto Cyn's body, fusing them together, with Cyn's body acting as the skeleton wearing Tessa's skin, though it still contains some of Tessa's bones. The hybrid form of Cyn wears Tessa's purple heels and black and purple dress, though the dress has been tattered. She has Tessa's black hair and bow on her head.

Her eye sockets are empty, showing Cyn's face screen instead, and her eyes are X-shapes glowing a neon yellow-orange color. Around the eyes, traces of dried blood can be seen as well. She has numerous jagged sharp teeth with a dark grey tongue. A ripped part of her skin reveals a code "1001" on her chest, similar to the ones of disposed drones bodies in the pile where she was first awakened by the Solver. In this form, she still keeps her yellow "MARKED FOR DISASSEMBLY" armband wrapped around Tessa's left shoulder. At the neck reaching to the ripped part of Tessa's corpse there is an arrow-like black bloodstain pointing downwards, on her left arm are two of these arrows, and on the left thigh there are two more of these arrows that trail down to the end of where Tessa's knee would be. In both the show, concept art, and promotional material, various seams on her body, instead of stitches, are lined with a symbol of four small arrows pointing towards the center, a symbol similar to the "scale down" computer icon.

Tessa's human hands also protrude above Cyn's drone hands, which hang freely from her wrists, with Tessa's human hands draped on top. She also has large, flesh-like tendrils poking out on her back; three intestine-like tentacles protrude out of the hybrid form's back in a similar arrangement to the Absolute Solver Translate symbol, which she uses to stand and walk around on.