Caesar

"Prince Marth, I am Caesar, and this is Radd. We are hired swords in the service of Port Warren. Grust has gathered its knights by the fortresses to the north. It's dangerous for you to stay here. Thankfully, the eastern castle has been left almost entirely unguarded; that's the place to strike. Please be careful, sire. We'll be fighting with you all the way"

- Caeser

Caeser is a playable character from Fire Emblem: Ankoku Ryū to Hikari no Tsurugi and Fire Emblem: Shadow Dragon. You first meet him along with his friend/counterpart Radd, where they offer to join your team.