 If you liked
Nanatsu no Taizai
|
 ...then you might like
Stealth Symphony
|
Both are fantasy manga about incredibly overpowered heroes fighting against overpowered villains. They use special weapons in order fight with their full power. The strongest of the main characters, Meliodas in Nanatsu no Taizai and Torama in Stealth Symphony, is usually calm and tends to not get emotional about things very often.