The best Reformer, in my view, was Balthasar Hubmaier. Though, while still a Roman Catholic early in his career, he, unfortunately persecuted Jews banishing them and burning their synagogue. Later, he disputed with Zwingli holding to Believer’s Baptism which Zwingli rejected. Zwingli had him tortured and coerced Hubmaier to recant, which, after leaving Zwingli’s jurisdiction, he bemoaned and repented of his weakness.
Eventually, Hubmaier was burned at the stake while his wife had a stone tied to her and drowned as mockery against baptism. Here is a short paper about the most educated Protestant Reformer: https://drbarrick.org/wp-content/uploads/2021/11/Balthasar-Hubmaier_Paper_rev.pdf