- both shows have protagonist’s that are mostly child-to-teen like that shares a common deep, secret pasts and are trying to liberate an area from foreign rule.
- both season have more lot of intense, factional plots and counter plots more than their prequel's.
- both have a faction that vying for control of different groups trying to exert their will on the grand picture of things.
- both anime ended with a similar stereotype ending and epilogue.
It is an odd recommendation but I can't help but see Blues EXE being similar to Vidar due to the same VA and both are mysterious individuals who are rivals with the main character. Both are cartoony in some way but have serious moments as well and Rockman has a history of having elements being influenced by anime such as Gundam for example.
When watching Mikazuki in his Gundam, I get a lot of Guts vibe from him making me think that IBO is inspired from Berserk. Both of the shows encompasses political and realistic themes but the only difference is that IBO has mechas and Berserk has warriors and supernatural powers. Another note is that Mcgillis shares the same VA as Griffith and both are Char Clones.