Disney jr is only at breakfast at h&v
For now, lunch is also Disney Jr. Lunch is scheduled to change from Disney Jr to Minnie and friends in early Sept.
Disney Jr. characters at H&V are Doc, Sophia, Handy Manny, and Jake (Little Einsteins have not been there in years). You can meet 3 of them (all except Handy Manny) near Disney Jr live on stage with a relatively short line.
H&V's food has gotten better recently, so I would discount all but recent reviews. Pricing is no longer seasonal, and from the sticky in this forum:
bfast . . . 11/24/2016 Adult: $34.08, Child: $20.24
lunch . . . 11/24/2016 Adult: $47.93, Child: $28.76
l-fantasmic 11/24/2016 Adult: $55.38, Child: $34.08
dinner. . . 11/24/2016 Adult: $53.25, Child: $31.95
d-fantasmic 11/24/2016 Adult: $60.71, Child: $37.28
You also might want to consider the Fantasmic package, if you do choose H&V.
Character interaction is the same set up as other meals. However, in our experience, we do find the characters will stay at each table longer than many other character meals as it is a relatively small restaurant, and they don't need to get through as many people.
All this said, I would not choose H&V just for the characters, as you can see 3/4 of them elsewhere (and the 3 you care most about), and the food does not excite you. But, if you were interested in the Fantasmic package, that would change things.