Japanese games have a number of different ways of handling narratives from a first-person perspective.
The typical “visual novel” approach allows the player to ride along inside the protagonist’s head, being privy to their innermost thoughts as well as the things they say out loud. But in other instances where this approach has not been used for stylistic purposes — and particularly where a silent or quasi-silent protagonist takes the lead — a companion character is often employed to either speak “for” the protagonist, or to complement them in some way.
Gal*Gun Double Peace featured the delightful Ekoro, who beautifully complemented protagonist Houdai’s bafflement at the situation in which he found himself through dry wit and a touch of sarcasm. And Gal*Gun 2, which features the player themselves as the participant quasi-silent protagonist, has Risu; equally delightful, but in a rather different way.