Navi Customizer

The Navi Customizer is a customization program built by Dr.Hikari. It was made for the Plug-in PET, Advanced PET, Progress PET, and Link PET. In MegaMan Battle Network 3, if you used a program the the current Style did not support and rebooted MegaMan.EXE, you'd get an error. MegaMan would not be able to boot up. In the 4th, 5th, and 6th game, however the errors went into hiding due to Alpha's forced overloading of MegaMan.EXE. In doing so, he nearly killed him, but when Lan gives Dr. Hikari Tadashi Hikari's letter, MegaMan.EXE is back from Alpha's body. However, his letter removed the Style Change. So, Double Soul was made as a suitable replacement.