Fukasaku is an elder toad over eight hundred years old that resides on Mount Myōboku. As the heirs of the Great Toad Sage, he and his wife Shima are revered as the "Two Great Sage Toads".
Fukasaku is a green toad with white hair styled in somewhat of a mohawk, very thick eyebrows and a small goatee. He has been seen wearing two capes: a high-collared one and a simpler version. On his back is a message that Jiraiya left before he died regarding Pain "the real one isn't among them", because it was burned into his flesh, it cannot be removed.
Fukasaku, like his wife Shima, is considered very wise and is greatly respected by all who know them well enough. In reality, he constantly bickers with Shima over small things when they should focus on the bigger picture, such as the fact that a battle will cause them to miss dinner. They are still close, as Shima is heartbroken after Fukasaku is killed by Pain.
Though Fukasaku remains serious in even the worst situation, but he and his wife will constantly find a reason to bicker with each other. He also has a tendency to call the Great Toad Sage, "senile" for constantly forgetting everything.
Fukasaku and Shima both seem to like Naruto. Fukasaku met Naruto for the first time when he brought the news of Jiraiya's death to Konoha. He found Naruto's nickname for Jiraiya to be both very fitting and very funny, but observed that Naruto, as he was, would not stand a chance against Pain, and offered to take Naruto away to learn senjutsu at Mount Myōboku. After what was a confusing introduction to sensing natural energy and drawing it in to blend senjutsu chakra, Fukasaku, in light of Naruto's rapid progress, believed that Naruto would surpass Jiraiya in power.
Shima is an elder toad from Mount Myōboku. As the heirs of the Great Toad Sage, she and her husband Fukasaku are known collectively as the "Two Great Sage Toads".
Shima has a green underside with purple marking around her mouth and the back of her body. The top of her head looks as though she is wearing a hair net with hair-rollers underneath, giving her an 'old woman' look. She has been seen wearing two types of capes: a high-collared one and a simpler one.
Shima is considered open-hearted and her personality allows her to see everything with great clarity. Because of this, she is adored by all toads as the "Mother of the Toad Way". She is greatly respected because of her old age and wisdom, but she still manages to bicker with her husband over small things like missing dinner. Despite this constant bickering, she loves Fukasaku very much, calling him "Dad" as is common among Japanese wives. She was devastated when she saw Fukasaku get killed by Pain. Like her husband she also tends to call the Great Toad Sage "senile" due to his forgetfulness.
Shima seemed to have been fond of Jiraiya and similarly was very welcoming to his pupil, Naruto, when he first went to Mount Myōboku to train, 'pulling out all the stops' at her and Fukasaku's home. During the Battle of Konoha, after Pain had stabbed Fukasaku and pinned Naruto to the ground through his hands, Shima called to Naruto not to give up since both Jiraiya and Fukasaku had given their lives because they believed in Naruto, and, if he gave up then, she'd never forgive him. [Source: wikia]
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