His hot-blooded personality makes him very popular in the team.

hot-blooded 是由形容词 hot（热的）和名词 blood（血液）加上后缀 -ed 组成的复合形容词。hot 在这里比喻为"热烈的、激烈的"，blood 指"血性、气质"。hot-blooded 合起来表示"热血沸腾的、充满激情的"，形容人性格热情奔放。