Railgun was really good with this and with the anime ending soon, I'm looking for something to scratch the itch. Index doesn't count as I'm planning to read the LN.

What I like about Railgun & what I'm looking for:

- Powers have rules.
Espers don't train for one montage and suddenly get the chance to beat Accelerator. There are clear, clear rules in place as how to characters can do the stuff they do. I'm also a sucker for power levels so there you go.

- 60% character-driven, 40% plot-driven.
This is where I got lost in the Index anime and part of the reason I prefer Railgun. It's more about characters doing the best with what they've got and learning from it rather than the plot making the characters do things they won't normally do. Characters get developed and have realistic motivations. (probably eliminates most ecchi)

- Lighthearted.
With how crazy the world is now, I'm looking for something that has more heartwarming and comedic moments. A serious arc like the awesome Sisters one is welcome though.

Similar manga/anime I've read/seen:

- Boku no Hero

- Shingeki no Kyojin (not lighthearted at all I know)

- Charlotte

- Alice Academy

- Code Geass

- Astral Buddy

- Overlord

Really appreciate the help since finding manga to replace Railgun has been hard. Also, please explain how similar the anime/manga you suggest is. Even just a one-liner will help a lot.[m]