List of all The Nextbots possession controls:

Apothicon's Fury:

Left-Click - Melee
Right-Click - Teleport


Baron Nikolai (Manticore) :

Left-Click - Minigun
Right-Click - Harpoon


Margwa, Fire Margwa & Void Margwa:

Left-Click - Melee
Right-Click - Slam
Space - Jump
C - Climb


Hellhound:

Left-Click - Melee
Space - Jump


Keeper:

Left-Click - Melee
Space - Jump
C - Climb


Panzer Soldat:

Left-Click - Melee
Left-Click + Shift - Cannon
Right-Click - Flamethrower
C - Climb


Parasite:

Left-Click - Liquid Attack


Russian Mangler Soldier:

Left-Click - Melee
Right-Click - Cannon
Space - Jump
C - Climb


Valkyrie Drone (SENTINEL):

Left-Click - Laser
Right-Click - Dodge


Spider:

Left-Click - Melee
Right-Click - Web Attack
Space - Jump


Thrasher:

Left-Click - Melee
Right-Click - Devour
Space - Jump
C - Climb