Lucas

Lucas is the son of the president of the Abiel Company and is the heir to the riches after his father retires
But things turn out for the worst when all he is met with is failure with every mission he does, his father threats to make one of his other sibling the heir or heiress to the company, which give him the passion to believe that even he could pass his father in success

He has a very rocky relationship with the protagonist, when meeting them he is spiteful and shows off a strong ego, but that ego slowly wears down and down til they almost see eye to eye as perfect rivals