What class/subclass for a 5 year old who is not a strong reader

[Bobthewizard]

I often recommend an arcane trickster for new players. They get to work on skills and combat basics at first level. Cunning action introduces them to bonus actions at level 2. Then they get to ease into spellcasting at level 3.

But for a 5 year old, ask him what he wants to play. Big, strong fighter (champion), sneaky thief, woodsman (either hunter ranger or scout rogue).

I think at this age, the most important thing is to help him play the character he wants. If he wants to be a giant teddy bear, make a bugbear fighter. If he wants to be a teenage ninja turtle, then tortle monk. If he wants to be a wizard, help him be a wizard. Show him how the rules can let him be whatever he wants.