When the Tamers arrived to the Digital World and fought their way to Zhuqiaomon, the D-Reaper secretly captures Jeri and replaced her with the first of its "ADR's" or "Agents of the D-Reaper", extensions of the D-Reaper's will created from the assimilated data of those it had consumed in the past. Developing an interest in its creators and adding it into its perimeters, the D-Reaper uses Hynpos's system to manifest its main body, holding its Kernel Sphere which Jeri was being held captive in, into the human world. The D-Reaper then turned the Shinjiku Metropolitan building into its base of operations while converting the surrounding area into the D-Reaper Zone. Other than its Jeri-Type Agent, the D-Reaper creates more ADRs as drone units that function as extensions of the D-Reaper's conscious to study human behavior while expanding its territory. Unlike the Jeri-Type, the succeeding ADRs operate outside the D-Reaper Zone by a red life line, similar in function to umbilical cords. When these cords are severed, the Agent becomes much weaker and easier to defeat, and weaker Agents will dissipate completely. The D-Reaper mass-produces a new type of ADR until the model becomes obsolete, each ADR numbered while given a codenames based on their appearance and function. The general design aesthetic of the D-Reaper was that of a "Digital creature", exemplified in such details as the jigsaw-like fringes of the Agents, and the optic fiber/telephone wire construction of the Reaper and Mother D-Reaper. Konaka remarked that he was especially fascinated by details like the wings on . Aramaki designed the "D-Reaper Zone" which appeared on Earth.