As a result of Moxxie's mind/mental change, the reader and the friend/sibling's memories and personalities were replaced with Moxxie's memories and personality, respectively.

Your vision swirled, dizzy and disoriented as you found yourself suddenly standing in a different world through a portal, with your closely bonded friend or sibling at your side. The architecture around you was unfamiliar and frightening, skies painted with ominous shades, buildings as quirky as they were menacing. This was not the world you knew. A red imp creature you instantly recognized as Moxxie, from Helluva Boss, greeted you with a wide, friendly smile. You and your sibling/friend shared a quirked eyebrow, knowing this was against the laws of reality. “I’m finally glad to meet you,” Moxxie said, “Blitzo and Loona can be...a handful, and I just thought I could use some twin brothers of my own kind.” Your puzzled expression didn’t stop him from leading you to the aforementioned invention. It looked peculiar and out of place in the eerily colorful alleyway, with wires and lights strewn about haphazardly. The moment you both were strapped into the bizarre seats of the invention, the world around you started spinning frantically. It was like a wild carnival ride that your gut wasn’t prepared for. You felt a pulling sensation from all directions, as if you were being tugged on a molecular level. In fits and starts, your bodies started to change. You felt shorter, smaller, with your weight shifting towards your legs. Your skin tingled as it changed to crimson red, complete with white freckles dusting your cheeks. Your hair defied gravity delivering a white pointy look that led up to curvy black and white striped horns. You could feel your tailbone extending, forming into a long thin tail with a quadrilateral barb at the end. Looking down, you saw your legs morphing into digitigrade hooves, and your friend/sibling was undergoing the same transformation. Your clothes did not escape the change. Your everyday attire warped and twirled around you, changing into Moxxie's signature navy-black coat with a black turtleneck and a white shirt, neatly adorned with a red bow. Lastly, you felt an odd pressure in your head. Slowly, your thoughts and memories started to blur, replaced by images and stories about an entirely different life. You recollected incidents about Moxxie's life as if they were yours, his memories, likes, dislikes, fears and joys cascading through your brain. Once the physical transformation was complete and the last of your old memories flickered away, replaced by your new persona, Moxxie's cackling laughter echoed around you, intertwining with your own. Glancing to your side, you saw your friend/sibling had become an exact replica of you, of Moxxie. "You've done it, Moxxie!" they chimed, their voice a perfect echo of your own. "I have," you replied, your excitement matching theirs. Now, as Moxxie's identical twin brothers, you and your sibling/friend are ready to face the world of Helluva Boss, thankful for the exciting new experiences your alterations will offer. You were no longer the butt of Blitzo's joke and not taken lightly by Loona anymore. Instead, you had a new family and a second chance to make the best of it.