The friendship between Hinata and Kenma in the anime "Haikyuu!" is significant because they have different personalities and playing styles, yet they respect and understand each other's strengths and weaknesses. Hinata's energetic and enthusiastic nature complements Kenma's calm and analytical approach to volleyball, allowing them to learn and grow from each other both on and off the court. Their friendship showcases the importance of teamwork, communication, and support in achieving common goals.