This one’s going to take a process of elimination.
Ron is an Envy person. Harry’s success poisons their friendship for a while. Anyone who feels so strongly that they covet against character is a Heart Type. In case you doubt, we also know Ron’s no Body Type. Although he loves quidditch and wants to be good at it, his performance is mixed. Also, he may like the strategy of wizard’s chess, but delving into the thinking of things as a Head Type would is not his strong suit.
This means Ron is a Two, Three, or Four.
Well, he’s clearly not a Three! To others the life of a Three can seem charmed. Ron’s the opposite. He seems cursed. If a Three got sent the moth-balled dress robes they’d turn it into a fashion statement and everyone else would want the same. Shame is really not in the Three wheelhouse.
Is he a Four? A Four can be tormented with the depth of their feelings, which Ron indeed is. However, Four Men are also extremely witty. It’s like they’ve drunk a truth bomb. They are so cutting, and yet fun. Ron, again, this is not.
That leaves a Two. Is Ron a Two? Whoa. Hard call. Two Men are very giving and sweet-natured. They are vulnerable to abuse because they’re so kind. They also tend to accumulate hobbies and the gear that goes with it. A Two Man is a tinkerer. That doesn’t particularly sound like Ron, either.
I’m going to go with Four, even though it’s not a perfect match. It’s the wildly swinging emotions that decide it for me.
Or, Rowling did not nail his character as thoroughly as she did with the others, and he’s really no number at all.