Ivan Bruel

Ivan Bruel is a student at Collège Françoise Dupont.

Appearance
Ivan is large and bulky with gray eyes. His hair is short and black, except for a tuft of long, dyed blond hair above his forehead.

He wears a black t-shirt with a white design of two crossing bones printed on the chest. He also wears black slacks with large belt loops and large pockets, along with white socks and khaki-colored work boots.

Personality
Ivan is a tough guy with a tender heart. He often appears grouchy and stubborn, particularly around situations he isn't interested in, like while being held captive at the Bubbler's party in "The Bubbler". But he also can sometimes be openly enthusiastic and expressive, cheering for Alix to beat Kim in "Timebreaker". The only person so far that he has shown a lot of warmth towards is Mylène, but he is willing to help others in bad situations.

Mylène Haprèle
Ivan has romantic feelings for Mylène, caring about her deeply. When she is upset for being easily scared in "Horrificator", Ivan tries to cheer her up and gives her a pin. In "Darkblade", he continues to be compassionate with her, hugging her to comfort her when Darkblade and his knights are closing in outside the Hôtel de Ville.{{HideSpoiler|His crush on Mylène is an indirect cause of his akumatization in "Ladybug & Cat Noir (Origins - Part 1)", and in "Stoneheart (Origins - Part 2)" he gets akumatized again because Mylène runs off after being scared by his loud serenade.

Once he transforms again, he kidnaps Mylène so they can always be together. Ladybug also uses his crush to her advantage: by making Stone Heart accidentally kiss Mylène by tying them with her yo-yo, she makes him drop his akumatized object.

Kim
In "Ladybug & Cat Noir (Origins - Part 1)", when Kim sends him a teasing message in class about him not having the courage to ask Mylène out, he gets angry and tries to beat him. Thus, Miss Bustier sends him to the principal's office, in front of which he gets akumatized.

Chloé Bourgeois
In "Stoneheart (Origins - Part 2)" Chloé calls him a monster because of his akumatization the previous day. That almost makes him angry enough to be akumatized again, but Marinette manages to calm him down. When he does get akumatized again, though, he kidnaps Chloé along with Mylène and then throws her from the Eiffel Tower, where she gets saved by Ladybug.

As a villain
As Stoneheart, he's a golem endowed with supernatural strength. Additionally, when he gets hit with an attack, he grows in size.

Due to Ladybug not purifying the akuma, the akuma multiplies and transforms civilians into frozen versions of Stoneheart. When Ivan becomes Stoneheart again, the copies of Stone Heart begin to move, and they are under the original Stoneheart's control.}}

Trivia

 * Ivan has a desk to himself in his classes, unlike how two students share one desk.