Penelope & Phoebe Plum

"You might seperate our body, but you shall never sever our bond!"

- Penelope & Phoebe Penelope & Phoebe Plum, known as the Plum Twins or simply the Twins, are major characters from LOTM: Witnesses of Sleepy Hollow and LOTM: Star Spangled Crown major members from the Merry Melody Circus affiliated to the Order of Flourish. They were formerly conjoined twins who later got seperated via operations. However, they developed a magic ability via traning, making them to conjoin and seperate once more.

They were the first "freaks" adopted by Harold Honeydew, also known as the Persian. They make their debut in LOTM: Witnesses of Sleepy Hollow Horsemen Saga - Death Arc: Haunting Past Sub Arc as minor characters.

Conjoined Twins (Wikipedia source)
Conjoined twins are identical twins joined in utero. An extremely rare phenomenon, the occurrence is estimated to range from 1 in 49,000 births to 1 in 189,000 births, with a somewhat higher incidence in Southwest Asia and Africa. Approximately half are stillborn, and an additional one-third die within 24 hours. Most live births are female, with a ratio of 3:1.

Two contradicting theories exist to explain the origins of conjoined twins. The more generally accepted theory is fission, in which the fertilized egg splits partially. The other theory, no longer believed to be the basis of conjoined twinning, is fusion, in which a fertilized egg completely separates, but stem cells (which search for similar cells) find similar stem cells on the other twin and fuse the twins together. Conjoined twins share a single common chorion, placenta, and amniotic sac, although these characteristics are not exclusive to conjoined twins, as there are some monozygotic but non-conjoined twins who also share these structures in utero.

Trivia

 * They are the second pair of twins introduced in Witnesses of Sleepy Hollow, after Christine Van Bilj and Colin Van Bilj. Unlike Christine and Colin, who are pigeon pairs, Penelope and Phoebe are sororal twins.