Midas has been through a series of personalities, but has never been completely memory-wiped. Therefore, inflections of crudely-removed personalities still persist, and show up in the currently dominant subroutines. For instance, while one of M1D-A5's central control programs has the identity of a scholar droid, the program has been mildly corrupted by some leftover military engineer droid code that sometimes makes his aloof yet mild manner seem unusually preoccupied with explosives, despite having no programming in demolitions.
While M1D-A5 changes regularly between two major programs, his central core programming has developed a single-minded focus on protecting 'The Maker'. With no real attachment to the Rebellion beyond this, M1D-A5 will spend more time protecting Monica than actively seeking to fulfill any mission.