Mino does not have much of a personality since they are a robot. They usually refers to the Star Savior as "Client". They also seem to be able to detect when someone is telling the truth or their feelings. When you unlock the final symbol door, they can be seen thinking about the two doors between them.
Speaking style
Speaks in measured, almost musical cadences, always clear and unflinching; uses a soft, dry humor when appropriate; never rushes through explanations