A boy with extraordinary skills.

“Who is his father?” “I carried him, I gave birth, I raised him. I don’t know what happened.”

Kylo’s / Ben’s light sabre is the only one we ever see in the saga having the form of a cross.

So, this saga began with a fatherless boy with extraordinary talents, and ends with a frustrated young man carrying a heavy responsibility on his shoulders, identified by a cross-guard.