Emi Koizami:
Emi Koizami is a middle aged school girl who is really smart, really shy around people, but really kind too. She often hides behind wall, and or her mother when meeting new people too. She loves her big sister Muki Koizami very much, she will never wanted to leave her forever. Emi couldn't help it but to follow Muki around wherever she goes without Muki spotted her. She wanted much attention from her big sis, and making sure she wasn't left behind, and always put on full supportive on her too. When Muki brings her friends over for first time when introducing them to her little sis. Emi hides knowing the was really too shy, and scared to meet them, but everything goes out great with them though. She also likes to study science stuff too, that way she can learn more about nature, space, and machines too, she took her time to investigate, and studying too, and that how she became really smart too.
Days later Emi feels really down when Muki's not coming back but busy saving the world. When she was gone, she was hopeless without her around. Until then she heard a loud crash from outside, so she went outside to check something out, and saw another little alien creature who was named Mushi, Montyosho's younger cousin. She was hiding behind tree very scared, but Mushi founded her from behind, causing Emi to scream, followed by Mushi screaming too. After a long chat, Emi became very use to her, and became best friends. Then later, they partner up to help save the world. Emi may not be brave, but she will fight for everyone, and her big sister too.

Mushi:
Mushi is an cute, and energetic alien from the galaxy. She is Montyosho's young cousin, she lives in a same planet as Montyosho does, and wanted to stay bonded with him. She was the last of the creation of Crystalia Nomura. Just like Monty, she was born as an little limbless ball, along with her ears with rings around too. Later on, she grew, and evolved into her new appearance which she now has body, including her arms, and legs, even has a tail too with rings around as well, also adds a little bow on her head too. Due to Crystalia's death by the Darkness, she remain forever unfinished, but somehow managed to make it out on her own. She took an explore around the empty place knowing no one's there, until she saw another spaceship and managed to make a flight out in space. While traveling, she discovered that she also has a cousin, that is Montyosho, and wants to know more about him, so she makes a tracking device so she knows where he's at.
Later on after she fully evolved, still on a search for Monty, but then an asteroid crashed on her spaceship and falls into earth and crash landed. She remain no injured, she looks around noticing she's on planet Earth. She hears the noise, flies and looks around, until she sees Emi hiding behind the tree. She was behind her surprising her with an "Hello!" Causing Emi to scream, followed by Mushi screaming too. After a long chat, Mushi realized that she's still looking for her cousin, and Emi wants to help her find him, and then they became best friends, and always want to be by their sides too.