Koetsuji Akisame is the philosophical Jujitsu master and doctor of Ryozanpaku who was an old friend of Miu's father, Fuurinji Saiga. He was also the the first master willing to train Kenichi (though he is the least considerate to Kenichi's feelings). Despite his seemingly small physique, he is actually known for having his muscles built to perfection. He also has very good insight on people, often knowing if they are troubled or hiding something; he sometimes even knows what a person is thinking, which scares Kenichi. He has no trouble using his friends as guinea pigs to come up with new techniques. Akisame is also capable of speaking fluently in Russian.
