There was a Bronco's (120th & Pacific) about 3 blocks from middle school and an old quarter arcade about 50 yards from that, needless to say, I've spent an obscene amount of time at both places after school.
Runza actually has the best double cheeseburger for a small chain. Every time I go there with someone they order a Runza and I order a double cheeseburger, they usually wish they ordered a burger

The fries are amazing also.
Since this is an Omaha thread I'll throw in some of my other favorite places to eat - pool players gotta eat
Pizza:
La Casa (thin and they use nothing but Romano cheese, no Mozz)
Valentino's Pizza (thick and gooey, great pizza)
Big Fred's Pizza (Similar to La Casa)
Mexican:
El Bee's and/or Fernando's - original El Bee's was 10 minutes from my house in Elkhorn. Brothers split up and one kept original and the other opened Fernando's - pretty much the same food.
Neither of them are traditional Mexican restaurants (which I prefer), it's more Americanized but it's better than Tex-Mex - which I'm not a fan of.
Traditional Restaurants:
Brother Sebastians (the atmosphere changed after it burned down decades ago but the food stayed the same - used to be the best prime rib in town)
Pink Poodle (This is actually in Council Bluffs but had better prime rib than Brother Sebastians)
Johnny's Cafe - when my dad was young he worked at a kill plant and a cow got out one day and ran though the restaurant! LOL
Joe Tess's place - best catfish tails in the region - so they say - I ordered the chicken

Gorat's Steakhouse is staple of the city, I've been there a couple of times but would prefer Brothers or Pink Poodle for a steak
I believe at one point, Omaha had more family owned restaurants, per capita, than any other major city. Given it's location to the largest stockyard in the world (at one point) nobody was surprised. They had/have some very neat old Italian places also but I'm not sure if any of them are still going.
On top of that, there are a million other great places to eat in the area! I really do miss the food there.