Riki appears both as an Assist Trophy and part of Shulk's Final Smash. All of his voice clips are directly ripped from Xenoblade Chronicles. Upon being summoned, Riki will announce "Leave it to Heropon!", and once his time is up, he disappears while saying "All go to plan!"
As an Assist Trophy
Riki stands in place and randomly uses three of the following Arts:
In Shulk's Final Smash
Riki appears in Shulk's Final Smash. He is summoned alongside Dunban to use a Chain Attack on the trapped opponent, before Shulk sends the foe flying. In this Chain Attack, Riki's appears to use his Lurgy Art.
In Smash Tour
Riki appears as a blue item: when selected, it draws all nearby items to the user as they walk.
As a costume
In Xenoblade Chronicles, Riki is one of Shulk's party members, being the second last playable character to join the team. He is a resident of Frontier Village, the village of Nopon, and that current year's legendary "Heropon" who was as foretold in prophecy. Due to his position, he is forced into Shulk's party as a matter of helping him and Melia fight the Telethia. However, the Village Elder, Dunga, reveals that this position as the Heropon has very little to do with Riki's worth, but was more of a way for Riki to pay off the huge debts he had accrued due to his children's huge appetites.
Riki is a very childish character, much like his appearance. He is very enthusiastic, gets hungry easily, speaks in a largely childish matter and often thanks himself for contributing more than he actually did in any given situation. After the party beats the Telethia in Frontier Village, Riki has very little bearing on the plot at large, and is mostly there for comic relief. However, he does show a knowledgeable side in cutscenes, as he was able to read Melia's habit of hiding any signs of weakness to the other party members, and decided to make an excuse to stop and rest once realizing she was tired and not telling them. A conversation in Xenoblade Chronicles reveals that he is actually 40 years old, and has a wife and eleven children; later on in the game, he is able to relate to Dunban's pain of losing his sister Fiora due to this fact, as he understood the difficulties of taking care of younger family members.
In combat, his fighting style is based on Arts capable of inflicting several negative status conditions to the opponents. In addition, he brings several gimmicky Arts with unique effects to play, along with party buffs that allow him to heal party members, boost stats at random, and more. These factors, along with his surprisingly high hit points (having the highest health pool of Shulk's party members, with Reyn being second), gives him a very good role as a supporting character to make battles easier. Six of his Arts are used in Smash 4 with similar effects as seen in Xenoblade Chronicles, and he can also participate in Shulk's Final Smash, Chain Attack, in a similar way to the Chain Attack mechanic in said game. During the Final Smash, Riki can be seen attacking with his Biter, a weapon specific to him, and also using a seventh Art, Lurgy.
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