Romulus's Links
When they first met, Romulus dismissed Cephus as weak, just Pandora's sidekick that made things slightly more annoying for him. And even when he saved his life, his opinions didn't change too much. It was only as Cephus taught him to survive as a mortal, to build and farm, to connect with others and accept help, did he start to slowly warm up to him. The more time he spent around the mortal, the more he became endeared to his kind nature and vast wealth of knowledge. By present day, he's fully attached, trusting Cephus' judgment more than his own. He's probably a bit overprotective.
Cephus was definitely leery of Romulus to start with. He was... kinda psycho. Even so, he was Cephus' responsibility, and Cephus tries his best to give people second chances. He's since proven himself to be really trying to be better, and he's earned his trust. And with the way Cephus' other friends have been treating him, he might be the only real friend he has, now. He's very fond of Romulus.
Pandora is the single most formidable mortal warrior Romulus has ever known, which is why she caught his interest so thoroughly to begin with. He was so fascinated he went out of his way to gives her challenges, which then turned to actually trying to kill her when she beat trial after trial and began coming straight for him. And even after he began getting lethal, she won again and again, until she fought her way right to his doorstep and beat the godhood out of him. If it weren't for her (then-inconsequential, in his eyes) friend, she would have left him to be swallowed by the void.
Romulus still holds a healthy respect for her, and knows better than anyone that she's strong enough to kill a god if she set her mind to it. Still, she's consistently uncharitable towards him, and maybe he deserves that, yeah, but it makes it hard to remain unproblematic when his buttons are constantly being pushed. He's still on pretty rocky terms with Pandora, despite now being technically one of her citizens.