The Fire Emblem series has a wide range of characters to meet, ranging from games to romance. This is true of Fire Emblem Warriors: Three Hopes. This is why the series may be a little confusing.
Is there a romance in Fire Emblem Warriors: Three Hopes?
There is no romance in Fire Emblem Warriors: Three Hopes. Like Fire Emblem Warriors, there is no romance to be had. A support system in Fire Emblem: Three Houses is a must.
In the fire Emblem Warriors: Three Hopes, what are a few antagonists and partners?
Partner Specials for Fire Emblem Warriors: Three Hopes are ideal for two of your characters to join forces for an attack. This may be one character stunning enemies and allowing another to finish them off. Partner Specials will likely develop a relationship/support system, allowing you to pair characters.
In the Mysterious Mercenary trailer, Adjutants appear to be assist you can call while in battle. This is seen in the Fire Emblem Warriors: Three Hopes. You may assign units to each character in a battle to attack or defend.