Co-op is... useful for unlocking but bad for some characters.

[DimensionalLucario]

I did co-op mode with Cadence, Melody, Aria and Noctura (As well as Monk) alongside Bard to get the bosses unlocked so I could practice them but when I tried other characters without Bard, you get some interesting side effects. For example, Tempo only has 8 ticks if paired up with Bolt and I imagine the same will be true with Coda.

So I also thought, which duo will have the easiest and the hardest time going through all zones? Here's what I think.

Easiest: Bard and Dove.
Reason: All mini-bosses the weakest counterparts, exits already unlocked and no boss fights on floor 4.

Hardest: Coda and Tempo.
Reason: Coda having 3 different things active at once alongside a literal ticking time bomb? Yeah... sure, Tempo can pick up gold and all that but he dies so quickly and won't even make it into the boss rooms without dying like Death Metal.

Anywho... I enjoy the game but am so bad at it.