Hi! It would be nice if the fish were available as an alternative to the default character. This way, players could use character selector mods like miniMAXIme to switch characters on the fly. Having different characters available to choose from would also be nice for multiplayer games.
I've made this helper mod that you can use to create your character properly (e.g. you won't overwrite properties like building_distance of the default character that could have been changed by other mods). The helper mod contains example code and documentation, so it shouldn't be too difficult to make use of it.
I'll add an optional dependency on your mod to miniMAXIme once your mod doesn't overwrite the default character by default anymore.