Seriously they are useless and completely redundant, the title character is so ridiculously unbelievable and powerful next to them the cast may as well be pets to him, and as non powered side characters serve nothing to him on a measurable level in anything even in competence and charisma. At least Batman's cast(non trained side character) is relatively equal to him as far as sharing a basis of actually being human and being capable of doing the stuff he can due to a having comparable expectations a street level hero takes you. People like Jimmy, Lois, Amanda Waller etc are very out of place in superman's constant fantasy narrative, they only serve as people Superman rescue as a simple concept when you need Superman to simplfy his character and give the character a home and life to live even though he owns a alien like hq in the artic. Nothing more than decorations to glorify a god as a human caretaker basically.
You think in a comic called Action, Superman's cast would be as equally active and impressive as Superman since he seems to be the only one who in his books can doing anything for himself as far as putting up a fight against beings who can kill cities and worlds, not even the ones who are street level such as toyman and parasite have any of his cast that can prove they don't need Superman to fight them. Also throw in Kara and Conner to, they have nobody in their titles that can keep up with them or keep up with their enemies.