Overview
Remember how you could play as Raiden in MGSV:GZ? You can also unlock him in MGSV:TPP.
Raiden Suit Requirements
To unlock the Raiden Suit you must have the following:
GMP 1190000
R&D TeamLv 53
Digitalis (Purpurea) x70
Digitalis (Lutea) x20
Grand Master Certificate (standard) (this is every mission s-ranked excluding total stealth, extreme, and subsistance)
Once you have met these requirements, you can then develop the Raiden Suit
Suit Details
This suit can be used anywhere throughout the game except FOB missions. It also does limit your rank to A-rank in story missions.
The only buffs to this suit is of course the bad-ass looking outfit and running faster than your horse.