Ramen Naniwa Menjirou [Osaka]
Let me tell you, this ramen is top-tier in Osaka - and I'm saying this as someone who actually lives here, so you can trust me.
Ramen 
Udon Odoru Udon [Osaka]
"Odoru Udon" translates to "Dancing Udon" - it's this wild, unique udon spot! They've got tempura made with maitake mushrooms, and let me tell you, it's absolutely mind-blowing! Tempura is totally essential with udon.
Japanese Curry Kyu Yam Train [Osaka]
This place is known for their unique, out-of-the-ordinary curry. It's super popular and highly rated online.