In reality, the beast is really the savagery inside the boys, so it changes as they change. However, Jack uses the argument of the beast's deception to keep them afraid and under his control.
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The last jinchuriki was Yagura who was able to have full control over the beast.
Use Beast Boy by pressing number 5. Then jump and press x. He should turn into a bat and be able tp fly. But beware, his energy will run out, and fast.
When it was initially mentioned by the littlun with the mulberry coloured birthmark on his face the beast was described as being a snake-thing that turned into creeper things. Jack later describes an unseen presence which he sometimes feels is hunting him when he is alone in the jungle. During a meeting many wild possibilities are raised, such as suggesting that the beast might be a giant squid or even a ghost. Simon is of the opinion that the beast is simply themselves while Ralph has always insisted that there is no beast at all. When Samneric claim to have been chased by the beast their description includes wings and sharp claws. Towards the end of the book, after Jack and his tribe have left offerings for the beast, Jack raises the possibility that the beast might be able to disguise itself and also offers the opinion that they couldn't kill it. So in short the boys variously thought that the beast was; a snake, a giant squid, a ghost, some sort of flying creature and later a god like thing that could alter its appearance Alternatively the possibilities were also raised that it might simply be a product of either nightmares or an over active imagination, it might also be a projection of the evil within themselves or simply nothing at all because there was no such thing as a beast. The littlun with the birthmark disappeared after the fire.
Jack convinces the boys (and arguably himself) that it was the beast they killed, which was their first reaction upon seeing Simon due to mob mentality. Even though Ralph and Piggy admit to each other they knew it was Simon, Jack perpetuates the myth of the beast on his side of the island. This is arguably because in keeping fear of the unknown alive on the island, Jack is better able to lead in a totalitarian-like way. He convinces the boys that even though that night they thought they had killed the beast, that they actually hadn't - that they actually couldn't - and he suggests leaving sacrifices for it instead.
Because she admired him for his confidence and courage ever since she was a little kid. That admiration grew into love. Watch Naruto Shippuden episode 166 or read chapter 437 for more info