Mercutio Marchege

Mercutio Marchege is the secondary antagonist of the anime Romeo x Juliet. He was originally assigned by Lord Leontes van de Montague to look after his son Romeo but was later adopted into House Montague and made heir after Romeo was cast out.

History
The son of Lord Montague's former top assassin Titus, Mercutio soon became a close acquaintance of House Montague. As Lord Leontes van de Montague became concerned about his son's behavior, he assigned Mercutio to pretend to be his friend to look after him.

After Romeo was banished from the family for siding with Juliet, heir to the House of Capulet, Titus attempted to blackmail Leontes into adopting Mercutio into his family and making him his heir with knowledge about his past. Leontes obliged, but also killed Titus in front of Mercutio to cover up his past, causing Mercutio to start to become unhinged.

As Juliet led the citizens of Neo Verona in an uprising against House Montague, Mercutio was ordered by Leontes to set fire to the civilian's houses in order to quell the uprising. He was stopped by Romeo, who defeated him in battle and attempted to convince him to stop looking up to Lord Montague, but Mercutio had already lost too much of his sanity to listen.

As the Capulet supporters stormed the castle and confronted Leontes, Mercutio showed up and fatally wounded Leontes by stabbing him through the back. Mercutio gloated the he was a "hero" now because he killed Lord Montague, but the crowd simply looked at him in disgust. Tybalt then told Mercutio that he wasn't even worth killing as Mercutio wandered off to an unknown fate.