Homelander's loyal lackies are the self-serving Jogger who burned up his powers and The Derp, biggest moron on the show. It remains to be seen where Black Noir stands on loyalty, but considering he was running errands for Edgars last season I am guessing its not Homelander who he ultimately answers to. SB has a lot of vices and PTSD, but he does not have the megalomania that Homelander has.
And on that general topic, I think A-Train is the shittiest person on the show. He has been given multiple chances to redeem himself, but always reverts to selfish short term gratification behavior. People have given him second chances and he as always chosen to do the shitty thing. Even Blue Hawk tried to genuinely make amends before A Train encouraged a full on chimp out on him. Pretty much all the other flawed characters have solid reasons for how they ended up who they were (Homelander is a genetic creation, Butcher had an asshole father and lost his wife, Deep is basically retarded, ect), but A Hole Train specifically chose to be a piece of shit repeatedly.