Bouquet's shadow is Hippopotamus. Hippopotamus may be weak and somewhat cowardly, but he has the ability to shapeshift, sometimes using that ability by wrapping around Bouquet to provide her with a disguise. Hippopotamus later gains the ability to copy the attacks that he is hit by. In the second series, he and Bouquet have been given the ability to merge with Blue Dragon or Saber Tiger to provide armor and make them appear in near-full form. He also worries for Bouquet's well being whenever a battle begins.    from wikipedia

As Shu's village was being attacked by an unknown enemy, he and his friends, Jiro and Kluke decide to defend their home. They soon meet warrior Zola and receive the powers of Shadow, an ability that let's them transform their shadow into a powerful monster. Shu receives one of the most powerful monsters, Blue Dragon, and they all set out to defeat their enemy.
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(Source: Anime News Network)

Michael Sorich is an American actor, writer and director active since 1977. He is currently known for his voice roles in the popular anime series <a href="https://anilist.co/anime/269/">Bleach</a>.<br>
(Source: Wikipedia)

Shigeru Nagashima, known professionally as Choo, is a Japanese actor, voice actor and narrator. His former stage name was Yuuichi Nagashima, he changed his stage name to Choo on August 23rd, 2006. He is a graduate of the Nishogakusha University Department of Literature and received training at Bungakuza's research establishment and the Seinenza Theater Company before attaching himself to Production Baobab in 1986. He transferred to the Tokyo Actor's Consumer's Cooperative Society in 2007.

Choo's hobbies include badminton and jogging, and he is a licensed calligraphy instructor.

(Source: Wikipedia)