I had a look at the Top Rank tab in Clash of Wills to check what teams players used to rank 1.

Not surprisingly, there's very little variety:

• ER Elena, CoI Melissa, BoV Ibara, Aya Brea, S Chizuru, BD Ellesperis (most popular team by far, I counted 62 players)
• ER Elena, CoI Melissa, BoV Ibara, Aya Brea, Richt, FA Rain (2nd most popular team: I counted 32 players)
• ER Elena, CoI Melissa, BoV Ibara, Aya Brea, S Chizuru, 2B
• ER Elena, CoI Melissa, BoV Ibara, Aya Brea, Richt, DK Duane
• ER Elena, CoI Melissa, BoV Ibara, Aya Brea, BD Ellesperis, DK Duane
• ER Elena, CoI Melissa, BoV Ibara, Aya Brea, FA Rain, DK Duane
• ER Elena, CoI Melissa, BoV Ibara, S Chizuru, BD Ellesperis, Richt

3 units were used by everyone in the Top Rank: ER Elena, CoI Melissa, and BoV Ibara. Aya Brea wasn't used by only two players: robotDA and uwubonic.

Of course there might be a few other combinations that aren't shown in the Top Rank (it only shows 100 players), but I doubt they would deviate much from what's there (maybe ER Elena, CoI Melissa, BoV Ibara, Aya Brea, BD Ellesperis, and FA Rain?).

I kinda miss the way the 1st CoWs worked in which some random EX3 NV could make it to the team just to build morale and give some support while the rest of the team took care of damage (remember LM Fina? Untamed Wolf Edel who everyone had at EX3?). But then again, Anthemoessa is the last boss of the season so it is expected to be harder I guess.

Anyway in case someone's still trying to rank 1, here's some videos: Kamikiro (most popular team), Resnaught 1 (2nd most popular), Resnaught 2 (with 2B), uwubonic (without Aya). Couldn't find any video featuring DK Duane. Edit: Found a video with DK Duane by horaciomonteiro85.