Bob Roth is Jagged Stone's producer and the owner of Bob Roth Records. He is also the father of singer XY.
Bob is bossy and greedy, only caring about money, as shown in "Guitar Villain" when he asks Jagged Stone to change his style to match that of XY, in order to sell more albums. He'll be dishonest in order to get his way, lying to Marinette when he asks her to create Jagged Stone's new album cover, which Jagged Stone requested, and tells her to base it off of the previous cover test design that is similar to the style of XY's promotional artwork. However, while begrudgingly, he does back down if he is threatened, not wanting to lose Jagged Stone's sales or deal with the wrath of his pet crocodile, Fang.
In "Silencer", he is shown to be cowardly hiding behind Marinette when being threatened by the titular villain or when he used Ladybug as a shield to defend himself against Silencer at the cost of the heroine losing her voice. His dishonesty also continues when he refuses to admit that he stole everything from Kitty Section and isn't afraid to blackmail others to get them out of his way, meaning that he is also pushy and forceful towards others to do their job like with Ladybug. Once out of danger, he is also boastful which led to him carelessly revealing the truth on live television.
Also in the aforementioned episode, he is a father who spoils his son XY whom he indulges and has never taught XY any morals or ethics as he always allows his son to steal other singers' ideas.