Mr. Cogetz, a wealthy Flemish landowner and businessman residing near Antwerp, bears a surname sometimes documented as "Cogez" or "Cozets" across adaptations. He rose from poverty through his own efforts, achieving considerable wealth within a single generation and securing a comfortable lifestyle for his wife Elina and daughter Alois as part of the nouveau riche.

He vehemently disapproves of Alois's friendship with Nello, a poor orphaned milk seller, due to Nello's low social standing and poverty. This opposition drives him to explicitly forbid their contact and actively intervene to prevent it, rooted in his rigid standards and dismissive attitude towards those he deems beneath him. Possessing a volatile temper, he exhibits controlling behavior within his household. This includes intense arguments with Alois, sending her away to boarding school against her wishes, and causing her to cower in fear during outbursts, such as when a vase was broken at her birthday celebration. This domestic stress contributes to Alois's delicate, sickly condition.

Following a fire on his property, he readily accepts the unsubstantiated accusation by the landlord Hans that Nello started the blaze. Based on this, he definitively bans Nello from contacting Alois. While his wife Elina demonstrates understanding towards their daughter and advocates for her, potentially acting as a moderating influence, Mr. Cogetz typically disregards her fruitless appeals. His antagonistic stance towards Nello shows no significant redemption or softening throughout the narrative across adaptations. His actions persistently function as a source of hardship and a social barrier for Nello.