Final answer:
When Mina goes to find Jonathan in Dracula, he has changed in terms of his character and emotions, becoming a nobler and stronger person but also emotionally distant.
Step-by-step explanation:
In the book Dracula, when Mina goes to find Jonathan, he has changed in several ways. Firstly, he has become a nobler and stronger person, displaying an unbending will. This is evident in Mina's observation that he had returned as a man, whereas he was a boy when he left. Additionally, Jonathan's emotions seem to be deadened and his eyes are filled with tears, suggesting that he might have gone through significant hardships and emotional turmoil during his absence.