One of the mechanics introduced a bit later on into Clair Obscur: Expedition 33 is Relationship Levels. You might draw comparisons here to another game like Persona 5, but Expedition 33 handles the feature a little differently. This Clair Obscur: Expedition 33 guide reveals how to increase Relationship Levels.
How Do You Increase Relationship Levels in Clair Obscur: Expedition 33?

For roughly the first 10 hours of the Main Story, you won't have access to Relationship Levels. This is because they're introduced during Act 2, and actually relate to Verso's relationship with the other main characters rather than Gutsave.
Once you have Verso in your party, you can go to the Camp on The Continent and begin increasing Relationship Levels. For information covering are there romance options, click the link.
Subscribe to Push Square on YouTube166k