Can you lose special staff members like Hideo Kojima, Ocelot etc. in the motherbase, if your GMP turns red?
By default, the 'special' staff such as Ocelot, Kojima, etc have Direct Contracts. This is indicated by the padlock symbol on the Staff Management screen.
Staff with a Direct Contract will not leave, and additionally cannot be extracted by opposing forces raiding your Forward Operating Bases (FOBs).