Murmukusmon

Murmuxmon is a fictional character from the Digimon franchise, a Mega Level Demon Lord Digimon. As such he is one of the few digimon to share that type with The Seven Great Demon Lords.

Abilities
He can take on the appearance of any Digimon.

Attacks

 * Gehenna Flame
 * Necro Interrogation

Island of Lost Digimon
Murmuxmon was an evil Digimon who was banished on the Flotating Island. It was there, he learned about Onismon and started the war between the Beast Digimon (As HippoGryphomon) and the Human Digimon (As d'Arcmon) for the purpose of extracting enough data to revive the ancient monster and conquer the Digital World to have his revenge. He was ultimately destroyed by Agunimon.

Another Gender Problem?
Late in the third season, Renamon said that Digimon have no real gender, but through the entire movie, Island Of Lost Digimon, D'Arcmon, a champion level angel Digimon, was referred to as a woman, for example, in the end of the movie, one of the human Digimon refers to D'Arcmon as a she (shouting: "She betrayed us!), but D'Arcmon later reveals that she is really Murmuxmon, who looks and sounds like a male. D'Arcmon's ultimate form is HippoGryphomon who also sounds like male, however, as said before, D'Arcmon is constantly referred to as a woman (Another example, when Takuya is talking with Dinohyumon, he refers to D'Arcmon as a 'she').

This is an issue that has been debated since Renamon's quote in Tamers, but may have been just a line in the US dialogue, as this is clearly overlooked throughout all five seasons, with Digimon being labelled as "he" or "she" rather than "it". Takato Matsuda from Tamers was known to refer to Guilmon as "boy", in the same way a dog is called boy or girl, and the Digimon themselves refer to each other as "he" and "she".

However, this line MAY have been mis-interpreted, as the seem to be male and female equivalents for most Digimon in the non-human types.