Mizuki

Personality
Mizuki ishighly popular due to his personality as he is very charming and can get what he wants very easily. He is also very caring when it comes to his patients and will even back talk to a captain should they try to avoid treatment. In battle he is usually calm and prefers to take his time. While not healing or in combat he is often with his captain and tries to encourage him due to Daisuke's low self esteem.

Zero Division Recruitment Arc
He just became lieutenant after Isane's departure

Second Comming of Aizen Arc
Has only been seen walking beside his captain.

Powers and Abilities
Spiritual Power: He has shown a decent ammount of spiritual power for a lieutenant

Kido Master: Due to him being the lieutenant of the 4th Division it's safe to assume that he has a high knowledge in healing type Kido

Swordsmanship: In terms of swordsmanship he is one of the weakest lieutenants and often cant spar on par with someone of his rank. He relies on his shikia just to fight most people on their level.