777, pronounced "Triple Seven" in the English version and "Three-Seven" (スリーセブン Surī Sebun?) in the Japanese version, is the lead singer of Def Märch, a rock band in Shibuya that also includes the reapers BJ and Tenho, along with Futoshi, the tech. He is a harrier reaper and thus wears the harrier reaper uniform, but his hoodie is unzipped and he does not wear the hood. He enjoys being able to exist both in the Underground and in the Realground so that he can perform concerts. On occasions Beat calls him Porcupine.
777 makes an appearance on Week 1, Day 3. He acts cool in front of Neku and Shiki, but when Futoshi comes in he acts more superiorly towards him. Apparently 777 is very controlling of the band, and rarely lets the other members step into the spotlight, as shown by Futoshi's negativity towards him. Neku noticed that he was a Reaper due to the fact that 777 was aware of them.
On Week 2, Day 4, 777 is found with his bandmates, Tenho and BJ, trying to find the band's winged microphone and forcibly enlists the help of Neku and Joshua. On Week 2, Day 7, it is revealed that they did not find the microphone but instead found a megaphone which could serve the same purpose.
On Week 3, Day 2, 777 encounters Neku and Beat and attacks them for the bounty on their heads. After failing, he tells them to erase him to keep his honor of being a Reaper, but they refuse. They then ask if 777 saw Mitsuki Konishi entering the concert area; he replies that he did not see anyone enter but checks anyway, only to be presumably erased, as following a flash of light only his choker is found on the stage.
In Kingdom Hearts 3D: Dream Drop Distance, 777 is an opponent the player faces in Flick Rush in the Tin Pin Tournament along with BJ, Tenho, and Sho Minamimoto.
- 777's name may be a reference to there being three weeks in the game, with 7 days in each week. It may also be a reference to "God's number", 7, though this is unlikely considering the tetragrammaton, God's name in numeric form, is 72.
777 · BJ · Koki Kariya · Megumi Kitaniji · Mitsuki Konishi · Sho Minamimoto · Tenho · Uzuki Yashiro · Yodai Higashizawa
Ai · Eiji Oji · Eri · Ken Doi · Makoto Miki · Mina · Mr. Mew · Shuto Dan · Sanae Hanekoma
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