Jiraiya
Jiraiya is a character in the Naruto manga and anime series created by Masashi Kishimoto. He is Naruto's godfather and mentor, training and traveling with Naruto. Jiraiya is one of the strongest shinobi, having been a student of the Third Hokage Hiruzen Sarutobi and one of the Legendary Sannin. Jiraiya was also mentor to Naruto's father, Minato Namikaze. Jiraiya is also a writer and has written several books, including Naruto: Tales of a Gutsy Ninja and the Make-Out series. He has been in love with Senju Tsunade since he first met her.
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Narutopedia
Screenrant: Naruto: 25 Things Only True Fans Know About Jiraiya & Tsunade's Relationship