Both Lunatic and Infernal

As for clearing all missions i use Navarre 4*, Alfonse, P.Azura, and Ike on lunatic stage with the same strategies as in infernal. I bait and OHKO both daggers with Ike. Then just gang bang Navarre with Alfonse and Navarre. I included all links below. Hope they are useful.

For the infernal one, I use Tana (hit&run), P. Azura, Ike (distant def seal), I bait and OHKO both daggers with Ike, kill Navarre with Tana and the dragon with Deirdre.

Hard (Killing w. Navarre): https://youtu.be/cFr0uyk5Ptg
Hard (Killing w. Alfonse): https://youtu.be/vu0o_1H_V5c
Infernal: https://youtu.be/DHA_4ulqQA8

Alfonse

Navarre

Ike

Performing Azura