Antasma appeared in 2013 video game called Mario & Luigi: Dream Team. Antasma is an evil bat king and one of the two main antagonists in Mario & Luigi: Dream Team, along with Bowser. His name likely derives from "fantasma," the word for "ghost" in various Romance languages, and the prefix "anti-."
Antasma seems to bear similarities in appearance to all of the previous antagonists in the Mario and Luigi series (Cackletta, Elder Princess Shroob, the Dark Star and Dark Fawful).
Antasma appears, for the most part, as a bat with a giant grin. At the beginning of the game, though, he appears as a purple cloud, and then a bat. Later in the game, he is shown in his true form, which consist of his cape, bow tie and two claws. In battle, Antasma takes his bat form or a more ghostly looking version of his true form. This form is taller and skinnier and reveals his arms.
In Pillow form, Antasma appears as a purple Pillow with his cape spikes and eyes.
Antasma's speech is based off old Dracula movies with most words having "v"s in them and screaming tics which come from his bat side. He makes careful decisions, since after his imprisonment, such as choosing whose power he needs to help realize his dreams, but can be jumped-on easily when in a false sense of security, such as Bowser attacking him in Dream's Deep and betraying him later on. He has a temper and a strong hate for the P'illo's, especially Prince Dreambert. Others show fear towards him besides the Zeekeeper, who sees him as just a pest.