The website also announced additional cast members. The new cast includes (Note: Name romanizations are not official.):
Natsumi Fujiwara as Batson Termonen, a dwarf boy who wants to become a knight smith. He met Eru at the academy.
Atsushi Imaruoka as David Hepken, Eru's senior. He is a young dwarf who wants to become a knight smith. He is called "the boss" at the academy, and the students have deep trust in him.
Sayaka Senbongi as Stefania Serrati, Kid and Adi's older sister with a different mother. She is a talented girl who is Laihiala Pilot Academy's student council president.
Masaru Ikeda as Lauri Echevarria, Eru's grandfather. He is the head of Laihiala Pilot Academy. He is often overwhelmed by the zeal of Eru's ambitions beyond common sense.
Hidetaka Tenjin as Mathias Echevarria, Eru's father. He is a combat skill instructor at Laihiala Pilot Academy. He teaches fencing to young Eru who dreams of becoming a knight runner.
Sayaka Ohara as Celestina Echevarria, Eru's mother. Eru's silver hair and beautiful appearance is from his mother. She has a gentle personality and kindly watches over Eru's growth.
Daisuke Sakaguchi as Tsubasa Kurata, Eru's previous life. He is a programmer and mecha otaku who is reborn after getting in an accident while buying plastic models.
The previously announced cast includes:
Rie Takahashi as Ernesti "Eru" Echevarria, a talented programmer in his previous life, now reincarnated into a fantasy world. He uses his mecha otaku knowledge to the fullest in an effort to make his own ideal Silhouette Knight.
Ayaka Ohashi as Adeltroot "Adi" Alter, Eru's childhood friend. She has a weakness for cute things, and always hugs Eru as if he were a stuffed toy. Kid is her twin brother
Shinsuke Sugawara as Akidd "Kid" Alter, Eru's childhood friend. He learned magic from Eru when they were children, and he has grown in power and combat ability ever since. Adi is his twin sister.
Yasuaki Takumi as Edgar C. Blanche, Eru's senior, and a big player at the academy. He rides the Arcanba, and displays skills equal to any true knight.
Kazuyuki Okitsu as Dietrich Knitz, Eru's senior who has great skills as a knight. His overly fussy attitude is his downfall, and he can't seem to leave things well enough alone.
Shizuka Itou as Hellvy Oberi, Eru's senior who displays outstanding competency as a knight. She is filled with a determination to win, and will tend to cut through the vanguard to get to the fight.
The anime will premiere on July 2 on Tokyo MX (10:30 p.m.), KBS Kyoto (11:00 p.m.), AT-X (9:00 p.m.), and Sun TV (12:30 a.m., effectively July 3 morning). The show will then later premiere on BS 11 on July 4 at 12:00 a.m. (effectively July 5 morning).