The character design doesn't scream "Luffy 1V1 fight"
Imu is either a Kaguya-like raidboss that will require either the entire Straw Hat Crew (may seem corny but SHs vs Imu would be a great way to end the story) or the D. Clan (perhaps Luffy/Dragon tagteam or Luffy/Dragon/Garp even if he's still around somehow) to gang up on her.
Imu is either a Kaguya-like raidboss that will require either the entire Straw Hat Crew (may seem corny but SHs vs Imu would be a great way to end the story) or the D. Clan (perhaps Luffy/Dragon tagteam or Luffy/Dragon/Garp even if he's still around somehow) to gang up on her.