Rantaro shows himself from the very beginning as not a bad guy, as he is ready to help survivors or provide a safe shelter. However, he still remains one big mystery, since even with a partnership, he does not talk about himself or how he got to this place, often just smiling calmly. He is quite reasonable, collected and knows how to keep a calm face in critical situations. He has a caring side and it shows up especially well with children, as Amami treats others like an older brother.