Ao no Exorcist, Owari no Seraph Recommendations
While the lead character of AnE is much more friendly both characters initially come across as delinquents but really love the people around them. They both start off with finding companions in a school setting as they also learn to combat the enemies they wish to get revenge upon.
The main characters both have swords, a hot temper, thirst for revenge and demonic powers.
Both have young protagonists that have lost people in the past and fight and grow stronger in order to protect the people they love. The main characters are both lively, determined, traumatized, friendly, and spunky.