Robotics;Notes, Gundam Build Fighters Recommendations
Robotics;Notes and Gundam Build Fighters both contain sci-fi themes dealing with the art of design involving robots. The main characters enter tournaments and takes on challenges both physically and mentally.
Both series has a lighthearted mood although there are also moments when you'll feel the depressive tone.
There is action (more so in GBF) along with mysteries involving some of the main characters. Minor hints of romance is also noticeable between some of the main characters.