Voadam
Legend
I would suggest one character per player and no NPCs, though a pet or two would be OK. This would be to go for them feeling they are the main character focus and not feel like they are in the background tagging along. I would tone down the combats for the two person group, either run them in modules designed for lower level groups or cut down numbers from defaults. I would focus on exploration and some talking interactions, neat things to experience and weird creatures or things to interact with.
A lot of intro modules for kids/new players across the editions have been presented as low stakes training scenarios (arena training or rat killing), which I think is less fun for a participant than something like be a ghost buster and check out a haunted house, or be Indiana Jones style archaeologists investigating newly uncovered ruins.
A lot of intro modules for kids/new players across the editions have been presented as low stakes training scenarios (arena training or rat killing), which I think is less fun for a participant than something like be a ghost buster and check out a haunted house, or be Indiana Jones style archaeologists investigating newly uncovered ruins.