The wiki calls Roxas Axel's "protege" XD Why do I like that word so much?
Protege
"Axel, Roxas will be accompanying you on your mission today." Saix ordered, not bothering to look up at him as he spoke. Axel scowled, glancing over at the blank as could be key wielder.
"What am I, his mentor now?" He asked sarcastically.
"You should be honored." The man allowed one of his rare, non-psychotic slight-smiles. "Others here would be thrilled to be in charge of the Key Master." Axel snorted.
"Key Master?" Glancing at the zombie standing behind him, he rolled his eyes. "How about he learns how to dress himself without help, then we'll consider the "Master" part."
I was watching Kingdumb Heart's version of Days... It was hilarious.
Axel: Oh great, now I have to babysit him? This is so stupid, I hate kids.
Roxas: Uh-
Axel: Oh my god! We're instantly best friends! Let's go!