Here are some of the resonances I found

[Yemeth]

So got all the figures except one. Here are some of the resonances I found:
The Annointed One+The Purified One= boosts some of Veredicto's hits, creating bursts of flame
The Ecstatic Novice+Nacimiento= Alchemical Time = Drinking Bile flask halts time for a few seconds
The Veteran one + The Tempest = Create chain lightning bolts when using Sarmiento and Cantella
The Annointed One+ The Alchemist= Replaces Venedicto's embers with toxic incense

[Cat]

Gonna add some of my own.

The Punished One + The guide = Rosary of Torment (Reaper Rosary launches a cutting wave that causes Mystical damage. )

The Scribe + Nacimiento = Liquid Faith (Drinking a Bile Flask regenerates a good amount of Fervour. )

The Demented One + The Partisan = Endless Wrath (Killing an enemy during Blood Pact renews its duration. )

[Mvmbleghost]

I forget the names, but +stun and +hp on execute give executions slow time.

[Lone Emissary]

Originally posted by Mvmbleghost:

I forget the names, but +stun and +hp on execute give executions slow time.

Yeah, Viridiana and the Ecstatic Novice. Very useful. I recommend getting Viridiana from the city shop as soon as possible. And the sword's upgrade to stun enemies more easily helps a lot with that too.

[GladiatorA19]

Pillager + lightning damage or miasma damage increase = dodge causes a lightning bolt or a poison barrier

[Ashes]

Gregal's Favour = The Scribe + the ecstatic novice = Increase Veredicto's strength

[Standard Issue Cat]

The punished one + the tempest = galvanic plead (blood pact imbues the blade of Ruego Al Alba with lightning)
The veteran on + Lebeche = Lebeche‘s Favor (increases Saramiento & Centella‘s strength)
The Pillager + The Partisan = Lebeche‘s Favor
I wonder if the resonances stack or not

Edit: some others:
Viridiana + anything with the red skull symbol = Jalogue‘s Favor
Ecstatic Novice + Nacimiento = Alchemical Time (Drinking a Bile Flask halts the passage of time for a few seconds)