Dr. Thomas Stockmann
The play's central figure. Thomas discovers the contamination and refuses to stay quiet about it. He is brave and principled, but also self-righteous and tactically clumsy. His inability to read the room costs him allies he could have kept.
Peter Stockmann
Thomas's brother and the town's mayor. Peter is not a cartoon villain. He genuinely believes that protecting the town's economy is the right call. He uses his authority efficiently and without obvious guilt, which makes him more dangerous than an openly corrupt official.
Katrine Stockmann
Thomas's wife. She supports him throughout but also worries about the family's practical survival. She is the character most aware of what idealism actually costs when you have children to feed and rent to pay.
Petra Stockmann
Thomas and Katrine's daughter, a schoolteacher with her own progressive convictions. She loses her job because of her father's stand and her own views. She shows that the punishment for dissent spreads beyond the dissenter.
Hovstad
The editor of the local newspaper. He talks like a reformer but acts like an opportunist. His reversal on Thomas is the clearest example of how progressive language can mask pure self-interest.
Morten Kiil
Thomas's father-in-law and a tanner whose yard is partly responsible for the contamination. He buys baths shares at a low price and then pressures Thomas to recant so the shares will rise. He turns Thomas's integrity into a financial bet.
Aslaksen
A printer and community leader who presents himself as a moderate. He chairs the public meeting and enforces the procedural rules that silence Thomas. His moderation functions as a tool of suppression rather than fairness.