Cache

Cache (キャッシュ) is the final boss from the game Rockman.EXE Phantom of Network, a NetNavi that manages a cache server.

Rockman EXE Beast+
In the anime Rockman EXE Beast+, Cache was the one responsible for creating several duplicates of NetNavis.(A.K.A the phantom navis)

Triva
Some people say that Cache is like Lumine from Mega Man X8.