In May 2016, DC Comics again relaunched their entire line of comic books under the DC Rebirth brand, restoring elements of the DC Universe that were erased under the New 52 while maintaining the continuity. Pyg re-appears in 2017's Nightwing #18, operating in Paris and creating Dollotron versions of Grayson and Damian Wayne, known as Deathwing and Robintron. Grayson and Wayne overcome Pyg, who tells them he created Deathwing and Robintron for Simon Hurt. He later appears in Harley Quinn #43–44 and Batgirl and the Birds of Prey #15. He appears again in Batwoman #11, in which Batwoman saves her ally Julia Pennyworth from Pyg after Alice leaks her secret identity to him.
Professor Pyg is usually characterized in comic books as someone who is suffering from severe mental illness. Cocreator Grant Morrison envisioned him as "one of the weirdest, most insane characters that's ever been in Batman [comics]" and said, "We hear a lot about Batman facing crazy villains but we tried to make this guy seem genuinely disturbed and disconnected ... Professor Pyg isn't from another world; he's from here, but he's very, very sick". Taking inspiration from the works of David Lynch, Morrison wanted the visuals in Batman Reborn, illustrated by Frank Quitely, to feel like a real world crossing over with a world of schizophrenia, paranoia, and the use of narcotics. They've stated that when Batman and Robin are facing Pyg and his Dollotrons, they are dealing with "the eerie, creepy, mentally-ill dark corners of life". The character uses drugs, lobotomy, and doll masks permanently molded onto people's faces to turn them into genderless Dollotrons, which he believes are perfected human beings.
Professor Pyg most commonly wears a pig mask, a makeshift surgical outfit, and a butcher's apron. Much of his original wardrobe in the comic books was designed by Frank Quitely and is a homage to the Edwardian suits worn by Rex Harrison in My Fair Lady.
Meg Downey said Professor Pyg is one of Batman's most disturbing villains. In 2015, IGN writers Jesse Schedeen and Joshua Yehl ranked Professor Pyg as the twenty-third-greatest Batman villain of all time, and in a separate editorial, Schedeen called Pyg "one of the crazier and more unusual" Batman villains created by Grant Morrison. Beth Elderkin of io9 called the character "one of the weirdest villains to come out of the Batman canon" while Bustle referred to him as "one of the comics' modern masterpieces, and one of its most horrifying creations".
In 2017, John Stephens said Professor Pyg is one of his favorite recently-created Batman villains for being demented, grotesque, and funny. Because the character was created recently, he also said Pyg is more contemporary than the classic rogues and did not have to be revitalized as much. When it was announced Professor Pyg would appear on Gotham, Digital Spy commented, "Gotham season 4 is going to introduce its most disturbing villain ever, so forget about sleeping ever again". Charlie Ridgely of Comicbook.com stated Pyg's appearance on Gotham proved he is "one of the most disturbed" villains who has served as an antagonist to Batman.
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