Engel and Egg have a brother-sister sort of relationship. Egg, however, has mixed feelings about her - simultaneously being grateful for her soothing companionship and material help, while not considering her truly reliable.
Engel has a permanent master-aura, that forces anybody perceiving her into intense pleasurable synesthesia and somewhat infatuated state. This can be an issue for people who have traumas related to these feelings. It partially affects technology, and can be transferred through cameras in weakened form.
Engel also has a unique vision, that reveals things in the darkness but limits her ability to see things in light.
Engel started working with Semiramis, alongside Egg and Scraping. Originally, the plan was for them to normalize Case 53s in media, with Engel in particular to film a sex scene for a show; the first ever mainstream sex scene with a Case 53. However, this deal was disrupted when Teacher subtly clued her into the fact that Big Picture was involved.
These events lead to Victoria, Tattletale, and Sveta seeking her out for information on Teacher. As consequence, she had to be hidden in Wardens Bunker to evade Teachers attention.
Together with Egg she attended emergency power testing of Case 53s, arranged by The Wardens to see if any of them could be useful in the fight against the Titans. She later joined the direct fighting and went along with other C53s against Titan Fortuna.
“She’s not someone you count on, unless you’re counting on her to be there. You hitch yourself to her and she brings you along while going this way or that.” [...] It was sheer luck he’d found Engel, in those first few months when there weren’t really phones and internet. He’d been so lonely in the aftermath that he would have latched onto anyone. Weeks and months without talking to anyone. [...] Seeing Engel on the approach soothed, and unwound some of the more intense frustrations and darker thoughts. She was, just by being near, a warm bath on a cold day, a delicious meal when he felt starved, a hug when he couldn’t remember ever having a good hug. - Excerpt from Infrared 19.a
“I love all of my brothers and sisters, but I loved you in particular.”
Present tense, then past tense.
“I will always cherish my memories of the company you provided me in darker days. You helped me find optimism and a brighter outlook in lonely days. Without that girl from the hospital, I would not be out and about today, chasing my dreams.”
“We could still talk.”
I saw the pain in Sveta’s face. No response came to her lips.
“Why the hell not? You’re being asinine about this whole thing,” I told Engel.
“I am grieving my friend Sveta,” Engel said. “It is easier to move on without reminders.”
“I’m still here.”
“You are,” Engel said, and her voice was accented more as she said it, still warm and an eerie, discomfiting kaleidoscope of pleasant sensations. “But she isn’t. And I will forever miss her.” - Excerpt from Black 13.10
↑It was interesting, seeing the interplay between him, her, and Scraping. He came off like the moody kid brother, her as the wiser, warmer older sister, and Scraping… was the referee? He reined in, chided, warned, and otherwise stayed out of it. - Excerpt from Black 13.10
↑Engel was… it was hard to frame it, even. Her hair glowed like a light shone from within every strand, and her skin was textured with a pattern that only showed where the light caught the edges of her face, but that was the smallest part of it. - Excerpt from Black 13.10
↑Engel was radiance, skin with fine fractal patterns etched onto it, like frost on a car that could only be seen from certain angles, her hair strands glowing in rainbow shimmers. - Excerpt from Infrared 19.a
↑When my eye moved over the lines of her face, I could taste sunshine at the back of my tongue, and feel a faint, pleasing vibrating song through my bones, like I was sitting in a massage chair that got to the core of me and played music through it. The sensations were full-body and varied, but always pleasing. - Excerpt from Black 13.10
↑Engel raised her voice, which raised the intensity of the sensations – touch, smell, taste, and shifts in my vision, that made the world pulse with added life and detail, contrasts and textures, like the world was a masterwork painting. - Excerpt from Black 13.10
↑“You do not have to look at me if it’s hard,” she told me. “I won’t be offended.
I looked away, nodding. “It’s not because you’re a case fifty-three, it’s because-”
“Of my power. Yes,” she said. She’d lowered her voice, which helped. “Often it is people who have been through things who have trouble with me.” - Excerpt from Black 13.10
↑She reached into her pocket for her phone. Edges of the phone had distorted to have an oil-slick shimmer where her hand touched it most often. - Excerpt from Black 13.10
↑To Engel, still. Even filtered through a screen, the image left me with a feeling running up and down my arms that made me feel like I was smelling a hothouse’s worth of exotic flowers. A caress at the face, a taste at the back of the mouth, like Anelace’s sweat had tasted." - Excerpt from Sundown 17.7
↑“Engel went to Teacher for help. She saw his organization, and had a sense of what he was building. Her unique vision reveals things in darkness and limits her ability to see things in light, and she saw enough hidden things to make her wary. He has a building larger than some cities, and he’s filling it. The lower floors were crowded enough that things had to be shuffled around and moved to keep her from seeing them, but she still saw them.” - Excerpt from Black 13.9
↑“Engel almost joined the Irregulars,” Sveta said. “She wanted to focus on real life things, friends, family. Stuff she worked hard to get. Then when she was ready, we- travel and getting her from where she was to us became hard. It never lined up, and then she found other things she wanted to do. Egg did join, but more as a tagalong or mascot, too young to do anything big.” - Excerpt from Black 13.9
↑ “We’ve teamed up before,” Newter said. “Synergy in powers, no synergy in anything else.”