Mako Tsunami participates in many tournaments so that he can use the prize money to buy a fishing boat and sail the mighty waves. He masterfully used his Sea Deck to give Yugi and Joey some of the toughest Duels ever. His signature monster "The Legendary Fisherman" unleashes its true strength when it swims out into his "Umi" field.
Immediately after the player claims the reward for Mako Tsunami's appropriate Character Unlock Mission, they will encounter Mako for the first time. He will give an exclamation of surprise upon seeing his surroundings, before declaring that this is splendid since he can see a whole school of prey. He briefly laughs, predicting that he'll bring in "a haul of a lifetime," but then turns serious, saying that Duelists should now prepare to feel the full fury of the open waters.
Until the player defeats Mako for the first time, whenever they challenge Mako to a Duel, he will be surprised and incredulously ask the player if they are actually serious in wanting to Duel him. He then laughs, before remarking that it seems a big fish has wandered into his waters. Mako then accepts the player's challenge, saying that he never turns down a Duel, but further warns the player that they've made a huge mistake by "swimming into [his] net." He concludes his dialogue by telling the player, "Prepare to sleep with the fishes!"
Upon Mako's first defeat, he gives a brief exclamation of frustration and admits the player won. He goes on to compliment the player, saying that they're as impressive as a shark among guppies. However, he also declares that this defeat won't stop him from owning his own boat and sailing the ocean, and promises that until he "casts off" again, he will never give up.
After the player redeems their final unclaimed reward for Mako Tsunami's Character Unlock Missions, they will encounter Mako again, who explains that since he can't head out into the sea until he has his own fishing boat, this is the reason why he'll become the number one Duelist, as the prestige from that position will allow him to acquire his ship. He goes on to declare that he and the ocean await each other, and that he is looking forward to facing everything that the waters have in store for him. However, he also declares he won't be traveling alone - he'll be sailing with his "The Legendary Fisherman" card, which he has won countless Duels together with, and will continue to keep winning with.
Can be used each time your Life Points decrease by 1500. In the Draw Phase, instead of doing a normal draw, draw a random WATER-attribute monster.
Your starting hand will reflect the card balance of your Deck.
Menace from the Deep
Can be used if "Umi" is on the field, and you have a Water-attribute normal monster on your field. That monster can attack your opponent directly. this turn. At the end of the Battle Phase, that monster is sent to the Graveyard. This skill can only be used once per turn.
When starting a Duel with Yami Yugi, Mako says "Yugi, it will be my very great honor to face you in a Duel!" followed by "This will be a true test!"
When he loses the Duel, he says "What a grand Duel! I salute you, my friend!"
When starting a Duel with Joey Wheeler, Mako says "Joey, this shall be a feeding frenzy!" followed by "You don't stand a chance against my Deck!"
When he wins the Duel, he says "You should have known better than to tackle the ocean without wearing a life vest!"
When he loses the Duel, he says "That was an excellent Duel, Joey. Congratulations!"
When Mako Summons "The Legendary Fisherman", a cut-in frame of Mako appears, and he announces "This card is near and dear to my heart. I Summon The Legendary Fisherman!" If that player hasn't already Summoned "The Legendary Fisherman" during that Duel, a cutscene of "The Legendary Fisherman" being Summoned plays afterwards.
Most of the time when Mako declares an attack with "The Legendary Fisherman", he announces "The mighty ocean commands respect, as do the monsters that inhabit it! I attack with The Legendary Fisherman!"
When Mako Summons "Fortress Whale", a cut-in frame of Mako appears, and he announces "I Summon the most powerful monster in the seven seas! Fortress Whale!"
Most of the time when Mako declares an attack with that monster, he says "I attack with Fortress Whale! Baleen Bombardment!"
When Mako Summons "Kairyu-Shin", a cut-in frame of Mako's face briefly appears, and he announces "You have no clue of the terrors of the deep! Feel the fury of Kairyu-Shin!"
(Voice lines found in game files but not currently not in game yet)
When Mako Summons "Amphibian Beast", he announces "I Summon Amphibian Beast!"
Most of the time when Mako declares an attack with that monster, he says "I attack you with Amphibian Beast!" followed by "Sea Claw!"
When Mako activates "A Legendary Ocean", he announces "I'm playing this card! The Field Card - A Legendary Ocean!"
When Mako activates "Forgotten Temple of the Deep" or its effect, he announces "My Continuous Trap activates! Forgotten Temple of the Deep!!"
When Mako activates "Fortress Whale's Oath", he announces "I activate my Ritual Spell! Fortress Whale's Oath!"