(He's quiet, watching Lucina as she admires her blade and listening to how highly she speaks of it. It definitely sounds like a special sword and hearing how much she values it just makes him feel all warm and nice inside. He's happy but he's happy for her and he's happy for Falchion too.)

I'm sure it's glad to be with you too. You know! If you take care of your sword, it'll take care of you too. So if you do your best here, so will Falchion.

(What a serious moment! Perhaps a bit strange considering he's talking about a sword like its a real person at times but it's nice! But Urashima isn't one to be serious for long so he claps his hands together once, smiling brightly at Lucina as he begins to ask the most important questions,)

I know your sword's name but I don't know yours! I'm Urashima Kotetsu. (Just... like... his sword...) But you can just call me Urashima.