Bitter Pill is a mercenary, always working for a cost, and calling in hard favors. She appears flippant about the unwritten rules, displaying a willingness to go after civilians.
In contrast to the more violent clique of villains in Cedar Point, Bitter Pill's group is strategic and methodical in their actions, focusing on monitoring the situation and enacting long-term plans.
In costume, Bitter Pill wears a medical mask, a scarf, and a white coat, with a short stick bearing a caduceus. She carries a bag resembling a fanny pack over her shoulder, which she uses to carry her tinkerings.
Bitter Pill is a tinker, specializing in medicine and drugs. Her drugs are primarily temporary in effect, requiring regular doses to have long-lasting effects. She sells her drugs untested on the black market for money and favors.
Medicine capable of reversing her transformations.
An unknown vial, apparently her last resort when surrounded.
A liquid that transforms her body into being twice as tall, with flexible limbs and super strength.
Nanomachines that cause victims to produce large amounts of a thick gray liquid from their orifices until they burst.  The nanomachines cause mutations to the bodies of the victims, and eyes and mouths appear in the piles of the liquid as it dries. 
After the Hollow Point villains were devastated by their attack on the Fallen compound, Bitter Pill left Hollow Point. She was among the capes gathered in Earth N when Breakthrough visited Lord of Loss.
At some point, Parian and Foil reached out to Bitter Pill to help a parahuman kid with body issues, but didn't pursue the relationship due to cost and Bitter Pill's questionable motives. Tattletale used some of Bitter Pill's black market drugs after the Undersiders were attacked by March.
Bitter Pill and Bluestocking were in attendance at the villain meeting at Sherwood Span.
With her group, Bitter Pill broke into a prison where Etna and Crested were being held, but Breakthrough and the Patrol Block interfered. They agreed to stand down and pay for the damages to the prison, in exchange for the two capes.
Bitter Pill's group quickly arrived once Antares' group started causing ruckus in Earth N's Frontier Row, but they got talked out of engaging heroes by Prancer. They recovered half-drowned Etna and left.
Once Antares' group returned to the portal and Bluestocking struck a deal with them, Bitter Pill and most of her team remained to assist in heroes' fight with Cradle's mercenary army.
↑ 1.01.11.21.31.4Tattletale raised her feet, closing one eye slightly in a wince. “Ninety percent better. Turns out taking untested, black market drugs have their merits.”
“She’s mercenary. Doesn’t give anything for free, calls in favors and calls hard.”
“You know her, huh?”
“Reached out to her after Sabah and I ran into a kid in a bad place. Kid’s powers didn’t do anything to fix their body issues, and really complicated conventional methods to fix it. We thought Bitter Pill could do something.”
“Is your power telling you that?”
Common sense. Bitter Pill did temporary work, but that work could be a lot of things. The only ways it would work were to pay for regular doses over the long term, or pay for her to drop everything and research something long-term.
“Yeah,” Tattletale said.
“She’s dangerous. We’re pretty sure she was looking to get the kid in a position where they were taking regular doses.”
“And get a kind of control over him. Fucked up, and it says a lot that she was willing. There was so little to be gained. With you?”
“I get it. I know how she is, and there’s no need for warnings. Yeah, sure, she’s demanding and she’s really hungry to gain some ground right now, but I like having legs.” - Excerpt from Interlude 10.x II
↑ 2.02.1“Powers complicate things, and they’ve got a lot of powers there,” Anelace said.
“Bitter Pill, tinker,” Brio said. “A lot of the people in Hollow Point are expected to partake, and that means truth serums, just to start with.” - Excerpt from Glare 3.6
Bluestocking didn’t agree, but argued the point instead, “Cops. Cops are fair game. So are the anti-cape soldiers.” - Excerpt from Blinding 11.1
↑“I’ll elaborate. We’ve got a few cliques forming already. Bitter Pill in charge of the brains, watching, listening, planning the longer-term plays. Not necessarily here, mind you. Could be jobs elsewhere.” - Excerpt from Shade 4.3
↑Bitter Pill. Medical mask only barely visible behind a scarf, white coat, and a short stick with a caduceus. She wore one of those packs that looked like a fanny pack, that was worn over one shoulder instead. Tinker stuff was attached to the strap. - Excerpt from Blinding 11.1
↑On the other side of the bottleneck were sixteen villains with a scattered few mooks. Mooks augmented with Bitter Pill’s tinker stuff, it looked like. Foaming at the mouths, in a way.
Bitter Pill had a group of six men and women around her, toward the back. They looked like zombies. Each had their heads lolling back, and black fluid flowed from their mouths like water from the edge of an overflowing sink. She was giving them orders, her voice lost in the other noises. - Excerpt from Shadow 5.4
“I have the stuff. Healing. It should get them to ninety, ninety-five percent. They’ll be hungry. Good enough?” Bitter Pill asked, a condescending note in her voice, her gaze too casual and distracted.
↑My team was standing beside me. I could see Bitter Pill holding a bottle so the cap was between her index and middle fingers, ready to drop it.
I wondered if Sveta would be able to catch it.
She hadn’t let herself be surrounded without a trick up her sleeve. The question was whether she’d throw all sense to the wind and go with that, or if she’d take the other route. - Excerpt from Blinding 11.1
↑They’d been able to abandon the ‘door’ because reinforcements had come. Bitter Pill was the first to make her way in, twice as tall as she had been but not twice as thick around, with limbs that flexed like they had rubber and not bone inside. Her mouth yawned open, froth flowing from the corner lowest to the ground, and her tongue lolled out, extended in length. She had a soldier in each hand, and she flexed her entire body to heave one up, then slam him into the nearest corner. The other she shoved face-first into the frozen dirt, with enough strength to leave a furrow behind.- Heavens 12.9
↑The man smiled, ear to ear, his eyes wide enough to reveal the whites. A gray stain began to spread across the front of his pants, then the back. What began as a leak became a pumping, a stone-gray liquid with the consistency of oatmeal flowing out of his pants leg to pile up around his shoe. Bucketfuls of the stuff filled the one pants leg and then began to flow out of the other.
The smile didn’t leave his face as fluid bubbled out of his mouth, then ears. His skin distended as the stuff piled up beneath it, his smile remaining so tight that it threatened to tear at his flesh.
Skin stretched so tight it was translucent, he began sweating, and the strained-out version of the stuff had an oily sheen. - Excerpt from Last 20.e6
↑If the fluids were put together with the original body mass of the man and the old woman, they were each triple the size they’d been, and the fluids showed no signs of stopping. The fluid that had settled for a while was changing in composition. Grey, it dried and it cracked, seams and wrinkles spreading across it.
Bubbles rose to the surface of the grey ‘oatmeal’. They popped as they swelled to a certain size, and left either toothy cavities or eyes where they’d been.
The man’s stomach tore open, the grey stuff spilling out, foaming, and gushing from the intestines and organs that had torn apart. Blood and the red edges of torn flesh and internals mingled with the grey oatmeal.
Teeth began to protrude from the edges of the wound, the portion of the midsection that was nearly torn in half becoming a mouth. Intestines joined with the grey oatmeal to form a tongue, with flesh like an elephant’s skin.
The old woman, hunched over, was gripping her forearms. Fingers bent, twisted, and then dug in, tearing at flesh. She broke her own bones, and the grey shit flowed through the open wounds as she pulled forearms away from elbows.
The grey junk crawled through the stringy mess that extended from the two parts of the arm, inflating and extending it. She lurched to her feet, her legs bound up in a skirt of the mess, and when she let go of her forearms, the grey stuff was solid enough that they remained extended. - Excerpt from Last 20.e6
↑Bitter Pill’s group had Bluestocking, the six mooks, Crested, Birdbrain, and Foggy Idea. That group was more visually distinct, all but the mooks being tidier, and they hung back. The mark between them and Prancer’s group was subtle. They were at the edge of the fog, and they held themselves differently. Crested with his fan and Birdbrain with a bullwhip were the only ones with weapons. - Excerpt from Shadow 5.4
↑Hollow Point’s capes were on the fringes, gathered like they had when Advance Guard had turned up in Cedar Point, with a divide marking the distinction between Prancer’s side of things and the others. Beast of Burden’s group, minus both Beast of Burden and Damsel, a twenty foot gap with only three capes in it, and then Prancer’s assembly, with an injured Moose, an injured Velvet, Bitter Pill’s group with Bluestocking frothing at the mouth, and the Speedrunners. - Excerpt from Shadow 5.12
↑Nursery and Lord of Loss were standing at the path leading between the manor and the dirt road. Lord of Loss was in his human form, massive. There were a lot of people standing to either side of the path we had to travel to reach them, and he wasn’t walking forward to meet us halfway.
“Be careful,” Sveta murmured.
Capes aplenty. I recognized a few. Bitter Pill was one. No Prancer, and none of the hyperviolent capes I’d come to think of as being the red-tagged, like the old capes on the parahuman online site who’d had the ‘do not approach’ banners across their profile. - Excerpt from Torch 7.8
↑They’d all gathered out in the middle of an open space that could have been a plaza, a parking lot, or a market space in the summer months. Now it was covered in snow. It was cold and there had to be a dozen places across Sherwood Span where people could gather, but nobody wanted to be the one to wuss out, so they stood in the cold, ankle or calf deep in snow.
The wounds in her legs made her think of Bitter Pill. She looked for the woman and found her off to the side, talking to Bluestocking. Blue had been hurt in the Fallen raid. It looked like she was back in action. - Excerpt from Interlude 10.x II
“I… she’s strong. But she’s unwilling. Unwell, but she realizes that now. I asked Bitter Pill, Bough’s partner, the healer in Advance Guard, Capricorn Red’s old boyfriend. None have what Amy has." - Excerpt from Infrared 19.g
↑Bitter Pill put one pill into a pocket, then lifted a piece of plastic to her mouth, a candy dispenser shaped like a woman wreathed in skin, tubes running from the folds to her nose and mouth. The head was levered back, depositing a liquid jet into Bitter Pill’s mouth. - Excerpt from Heavens 12.8