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Im guessing Ricken for Tharja or someone who can pass Vantage
Gregor for Sully (access to Counter, Aegis, Pavise, Renewal, and Sol, +5 Skill cap, Hero class for Kjelle)
Idk for Olivia Virion gives +1 Str/Mag and +4 Spd/Skill as well as Archer, Wyvern Rider, and Mage which are classes Inigo cant get. There might be better options but other people prefer pairing with someone else.