Mercenaries are friendly robots deployed into combat to assist BOTS in Sector, BvB & Virus Assault modes. They are all fairly effective in Sector and are mostly distinguishable by their designs, however there are some Ohka BOTS exclusive mercenaries that are more powerful in PvE modes. However, in BvB mode, all mercenaries bring different strengths, weaknesses, styles and canister drops - making the choice on what mercenaries to bring in BvB an important one.