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Thoughts on Warlords and legendaries (Assuming they do a sequel in Ransei with Gen 7 'mon)
Oichi: Xerneas, to go with her healing and fairy theme
Ginchiyo: Raikou, why they didn't do this in the original is beyond me
Misuhide: Suicune, especially since his story is about "purifying" a black wave
Yoshimoto: Pheremosa, assuming he's less of a joke character
No: Giratina, especially since her perfect link is with a Ghost or Dragon type
Kanbei: Blacephalon (Shiny if it were to go with his attire)
Muneshige: Zapdos to go with the theme of Volterra, or Tornadus Therian form to match better with Staraptor
Gracia: Kyurem Totally not to match with Gates to Infinity with Kyurem's powers
Yukimura: Moltres, especially since Moltres was originally supposed to be in the game
Magoichi: Landorus (Since it's the closest match to his perfect typing)
Kai: Entei, just look at her design
As for what I want in a sequel, I kinda want Ransei 2.0 with more fleshed out abilities, locations, and maybe 2 moves per Pokemon with a building to interchange them, rather than 1 move per Pokemon, rendering some useless.