As a youth he was involved in a spaceship crash that killed many people. Since then he has blocked out the memories of the event and become an emotionless warrior.
Anesthetic is a hover-leg AC equipped with a plasma dispenser, dive booster extensions, small missile launcher weapon arms, a large missile launcher, a multi missile launcher and an overboost core. The unit is capable of ignoring weight restrictions.
This AC is best fought in The Caves and equip anti-missile extensions. the Large Missiles aren't dangerous as long as you can avoid them and with AMS, you can be well protected. He is a very lightweight AC and can't take much damage. As long as you bring heavy firepower, you can defeat him quickly...