Rein Helmer
レイン・ヘルマー
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| Rein Helmerレイン・ヘルマーO | |
| Aliases | Jii-san, Jiji, Rein-san, Helmer-san |
| Measurements | Height: 174cm |
| Birthday | 10 August |
| Hair | Balding, Beard, Moustache, White |
| Eyes | Brown |
| Body | Old, Overweight |
| Clothes | Bolo Tie, Boots, Hat, Shirt, Suit, Suspenders, Trousers |
| Personality | Friendly, Kind |
| Role | Engineer, Famous, Legal Guardian, Magician |
| Engages in | Fishing |
| Visual novels | Side character - Katahane |
| Voiced by | Yamanaka Souichi |
DescriptionThe greatest Doll engineer of the modern time owning the title of National treasure. Cero's caretaker and the creator of Belle who always calls him "Father". | |