Makoto is height is around average being taller than sekai and noticeably taller than kotonoha, he has brown eyes, black hair, and is usually seen is his regular school attire. Which is a like a suit it consists of a white dress shirt, red tie, blackish grayish coat and black pants.
In the begining of school days Makoto is shown to be really nice and considerate, but throughout the anime he is shown falling into his lustful desires more and more. He is shown to be nice and only wants to make sure his relationship with Kotonoha works out, but then soon falls for Sekai. This was the begging of the lustful desires. After around 8 episodes he is shown to only care about sex and doesn't care who it's with.
Throughout the School days anime he has many, many, MANY relationships with many girls including but not exclusive to Sekai, Kotonoha, Setsuna, and Otome to name a few. It is not shown that they are having sex, but you do get to see the atmosphere and here the noises of them doing said sex. In total I believe he has had sex with about 8 different girls in the anime multiple times each.