Senkaiden Houshin Engi

Kingdom is being ravaged. Protagonist is connected to both sides of conflict. He isnt all powerful there are troubles among the way. You never know what sort of plot twists story might bring... 

Both are action anime from the 90's that involve an overpowered flying red head kid and characters tasked to hunt down evildoers. Super Kid differs with a task-force of "super kids" who work to arrest space criminals. While Houshin Engi involves a corrupt empire, dark magic, evil spirits and a world of the brink of destruction, where its hero is tasked to hunt down all the evil in the land. I can't say I would recommend these anime to anyone but if you want to try them be my guest. 

Witch/"demonic guy eating meat" manipulate emperors and plunge empire in chaos and corruption. MCs team up with their mates to dethrone emperor. Both anime include special weapons in soul hunter it's Pao-pei and in Akame ga kill it's teigu. 

Both involve a team made of a human and a demon/ spirit that fights "evil". 

Stories mostly involving fighting/war that ultimately end up in a unexpected plot twist. Both are pretty wild 26-ep rides.