It could be anyone really. A person who has a collection of interesting stories and likes to be in a relaxed state when sharing them. For instance, a traveler who has had many adventures and likes to put on a cozy robe in their living room after a long journey and then tell their travel stories to friends or family. Or it could be a teacher who wants to make the story - telling session more engaging for students by creating a bit of a theatrical element with the robe - wearing and then sharing a historical or literary story.
It simply implies that the speaker has the intention of donning their robe and then proceeding to tell a story. The robe could be seen as a symbol of comfort or a sort of ritualistic garment for this storytelling event. It might also suggest that the story is something personal or special, and the act of putting on the robe is part of the build - up to sharing it. For example, if it's a family story, putting on the robe could be like getting into the right frame of mind to pass on a family tradition through the story.
Yes. This event occurs as a significant plot development and has a major impact on the story. Mikasa's action is driven by complex emotions and circumstances within the narrative.
Well, sometimes he uses his titan's speed and agility to dodge the Colossal Titan's attacks and then strike at its nape. It's a classic way to take down a titan in the Attack on Titan universe.
Well, it really depends on the Christmas story. If it's a really sad one about someone being alone during Christmas or something tragic, then maybe. But generally, most Christmas stories are positive and full of hope, so I probably won't cry.