(from writing this post I realized how much I like ponies)
When I was looking at horses, I wanted a Fjord, but a few Haflingers popped up. The one I considered seemed very sweet and had a good work ethic. Even at thirteen-years old, he was smaller (height and build) than my Fjord. Personality, Fjords and Haflingers seem very similar: sweet and personable, with a “draft pony” streak to them (as I call it). I’m basing my response off the one Haflinger I met, however. I’ve met multiple Fjords.
Based off what has been said, Fjords are similar in that they can be stubborn and the more you force them to do something, the more they will fight you. That said, they are not mean. I think the key word is “stubborn.” If Haflingers are similar, you can generally work them through it with time and patience.
I grew up with a Welsh pony (I can’t remember what section it was). He was the most patient, perfect kids pony. From memory (since I was pretty little when we owned him), my Fjord is nothing like him apart from the very loving, personable personality.
If you can go meet one, I definitely would! I really like the “draft pony” (that’s what I call it) personality, i.e. mix of draft and pony. And as already mentioned, each breed and horse are definitely different. I didn’t go with the Haflinger because he was older than I wanted and he had been “cowboyed” on. That said, he was a cutie and I liked his personality a lot.