My favorite Sannin would be Jiraya, his jutsus are amazing and he's such an amazing teacher to Naruto. It also shows even tho he is extremely perverted, he can be an awesome ninja when he gets into battle. I was so shocked when Jiraya died against Pain tho
Thanks LilJz, that's true this is a sad part, but at least he enyou their life being as wanted. Talking about his jutsus I remember one when he use the stomach of a frog as walls.