The party "system" in TiTS (if you can even call it that) is negligible.
You see, unlike the protagonist in CoC2, Captain Steele wasn't intended to have combat partners (as far as I know) and, as such, was designed to be able to dish out fucktons of damage to enemies, regardless of how many of them there are. Enemies only need to be in groups to counter Steele's stunlocking ability, and even then, it hardly ever works when they're all blinded or burning from Steele's special attacks.
Meanwhile, the very few sidekicks/drones Steele can have hardly ever help. Steele is just too god-like on their own to need assistance in any way.