Haku lead with Haku friend + Echidna/Vampire Lord/Drawn Joker/anything else.
Haku will help you a LOT where you can't succeed with Luci. That 12.25x ATK is great. And since the 12.25x applies to ALL colors once you match the 3 required to activate her, you can use green or light sub/off colors if you have no other options. Some info and tips on your Haku subs:
- Echidna is a staple on nearly any team you make. Some will work better without her, but level her and have her in reserve. Delay = incredible.
- Vampire Lord is also a strong sub, especially max skilled. If the day comes that you can get his D/B busty, he'll be an amazing Haku sub. Until then, he's replacable-ish, but Dark damage is some of the best in the game.
- Drawn Joker has blue subtype. So he covers one of your Haku color requirements. Also, he has decent RCV and converts those dumb light orbs to heart orbs (which Vamp can turn to dark).
- The extra slot can be anything you want or have that helps you. You could through Luci in there for his stats and active, GrOdin for his stats and awakening, CDK for orb changer, etc. This is your flex spot.
Hope that helps a little. You also can stick with your Luci team, you just probably need to level and busty some of your subs.