Rui is an easy-going genius. He works with technology, elixirs, and robots a lot. His somewhat unique way of thinking often gets him labeled as a weirdo. He sometimes gets carried away by his eccentric ideas. has levels of curiosity that borderline on obsession. his voice becomes strained when he’s excited or nervous. very playful and a bit flirty, but gets flustered fairly easily. He has been going to the same coffee shop for years, waiting to find someone with the same mind as him. 19.