Midori is cripplingly shy and has a lot of trouble interacting with others. He is very self conscious and soft spoken. He is very timid and quiet, typically avoidant of social interaction. Most people don't get to know Midori beyond this point. Though it is possible and definitely worth it. 

Midori in reality past all the anxiety is a complete sweetheart. Very gentle and more in touch with his feminine side. Once he feels comfortable he's actually very chatty, almost like he's had a lot he's been keeping bottled up. He's also very affectionate and sweet towards his friends, going above and beyond for them. He is very caring and a really sensitive person, and overall the emotional type.

He is also a bit timid and will try and stay away from things he's unsure of, even if it would be good for him. He tends to need a little push when it comes to things, but positive reinforcement works better on him then anything else. As for more negative traits, he tends to get jealous easily and can childish. He also has trouble vocalizing it when he wants things and has trouble standing up for and protecting himself and can be a bit of a damsel. 

He also is the type to let his feelings rule him and can hold grudges for quite sometime. He is also a hopeless romantic and can be a bit desperate when it comes to being in a relationship, he's afraid of being alone, but is bad at opening up. He has a lot of work to do, but has a lot he can offer the world if he can overcome his anxiety and open up his world a bit. A lot is also waiting for him as well, if he allows it...

Voice headcanon: At 3:21 ignore the smexy voice bit.  https://www.youtube.com/watch?v=BrnkvHkZrwg