|Novel||Naruto Gaiden: The Road Illuminated by the Full Moon|
Log was created as a synthetic human by Orochimaru, being cultivated from an embryo and given the name Mitsuki (ミツキ, Mitsuki), after "Tsuki" (杯, Literally meaning: Vessel) and the sixth sign of the Chinese zodiac calendar, "Mi" (巳, Literally meaning: Snake). However, he rebelled against Orochimaru, escaped and, now calling himself Log, started down the path of destroying the original embryo from which he originated, deeming Orochimaru's experiments to create life unethical. This background story was soon revealed to be a ruse set up by Log and Orochimaru in order to force the young Mitsuki to make a decision: either join him in destroying Orochimaru and eventually themselves, remain with Orochimaru and follow his orders, or choose his own path in life.
He seems to be a rather calm individual. He also likes to smoke.
Log is a tall individual with dull-blue, shoulder-length hair, and golden eyes. Overall, he bears an exact resemblance to his clone sibling Mitsuki with the exception of a scar across his right cheek. When first seen, he wore a dark-coloured haori, which concealed his entire appearance. When confronting Orochimaru and Mitsuki, he wore what appeared to be a modernised form of a shinobi battle armour complete with large arm-guards, outer thigh-guards and a hybrid breastplate. He also wore a kabuki mask, which had slits for eye-holes, a protuberant nose and a frowning mouth. He takes to using an ornate snake-themed lighter, and carries a sword strapped vertically to his back.
Log appears to be quite skilled as he was able to temporarily fend off and counter his father's — who himself is a renowned shinobi — attacks for a short while. He also makes use of a sword in combat, showing that he at least has some skill in kenjutsu.