In patch 1.14, Genshin Impact added Hangout Events, which essentially allow you to spend time with characters one-on-one.
Each character has six different endings to their events depending on the choices you make, and you’ll have to get all six endings in order to get all the rewards, which include character experience, food, and Primogems. These events are not locked behind any time gate, so you can take your time doing them.
To unlock a character’s Hangout Event, you’ll need to use two Story Keys. You get one Story Key for every eight Daily Commissions you do, so it’ll take four days to get enough keys to unlock one story. Once it’s unlocked, you won’t need to use any more Story Keys on it.
To access Hangout Events, open your journal and click Story Quests in the bottom left corner. There’ll be a tab that has a book with the companion emblem on it, where you can select which Hangout Event you want to do.
Currently the characters that have Hangout Events are:
Once you complete your first route, you’ll be able to pick up the story from where it branches off, so you won’t have to redo the stories from the beginning just to get the different endings.
To pick up at a specific point, click the quest you want to continue and then select Begin Hangout.