Mako Tsunami is a character in Yu-Gi-Oh: Duel Monsters. He first appears in the episode "Attack From the Deep". Mako hopes to become a master fisherman like his father was, and created a very strong sea monster deck.
When he first met Yugi and his friends, Tristan and Joey managed to steal some of the cooked fish sitting on the fire pit, which Mako initially became defensive of it. After realizing Yugi was the same Yugi that beat Seto Kaiba, Mako become alot more friendly and was willing to share his food, however, this was part of his plan to "bait" other duelists into dueling him, which he mentioned he already defeated someone else. During his duel with Yugi, Mako reveals his father went missing at sea during a very bad storm. While his father tied Mako to the ship in order to save him, his father did not have enough time to tie himself to the mast, which resulted in him being lost at sea while the boat Mako was on washed ashore.