Keiichi is optimistic or pessimistic person depending on the situation, can be calm, a procrastinator, and very sarcastic at times. Keiichi conducts himself to be a sociable person and is often easy going with others even when it's not his true nature. He's very skeptic of his surroundings and keeps a close eye on Mayomi and Yuki even though he can easily be distracted. However when the time comes Keiichi can be a very dependable friend, when he's not annoying everyone to death with his exaggerated uses of sarcasm.
Earth Manipulation: Keiichi can create, shape and manipulate any "Earthen" elements including most solid objects, specifically all minerals and mineral compositions regardless of their state (mountain, boulder, sand or dust), dirt, soil, etc.
Earth Empowerment: Keiichi can become stronger, faster, more durable, etc. when he comes in contact with earth/land/soil/plants, possibly unlocking abilities related to the affinity and enhancing the existing powers.