Every volunteer fire department and Catholic church in the Pittsburgh area seems to have a Lenten Fish Fry. I'm not sure what type of fish is common for Lenten Fish Fries here. It's quite mild, with a mild batter as well.
It is very typical for a fish sandwich here to be a massive amount of fish, far out of proportion to the bun. Some examples:
Donatelli's Italian Grocery in Bloomfield advertises a one-pound fish sandwich that will leave me feeling full after two different meals.
Armand's Fish nearby offers an almost-as-massive portion of fish, but on a significantly smaller bun.
And the Wilkins Township VFD #3, where we go for a nearby fish fry, considers a sandwich to be two foot-long pieces of fried fish and a hamburger bun. (We have learned from experience that the right order for us is one sandwich and an extra bun. We break each filet in half and stack the pieces to get two sandwiches that are thick by our standards.)
Besides fish, fish fries might have fried shrimp, or perhaps deviled crabs in a silver-cardboard imitation of a shell.
For side dishes, french fries and coleslaw are ubiquitous, and mac and cheese and haluski are common. Pierogies are a possibility.
None of this has much seasoning at all, except for the butter for the haluski and pierogies. (For some reason, I am under the persistent misapprehension that haluski is seasoned and flavorful. I cannot recall ever having any haluski with much flavor, but I keep ordering it and being surprised at how mild it is.)