Please note that this is the Narutopedia's article on the character from Amegakure. If you are looking for the article on the similarly named Tazuna from the Land of Waves then you should head to Tazuna.
When she attends to Jiraiya, he manages to learn information about Amegakure and Pain by talking to her and reading her letter from Ryūsui.
According to Jiraiya, she seems to resemble Tsunade with her large breasts and blond hair, and even their names start with the letter "T". Furthermore, both their names contain the same kanji, just reversed of each other.
Tezuna also seems to be fond of cows given her cow pattern dress and cow head necklace.