not sure what the consensus on translated names is yet, listing popular ones

Wagner / Vagnar [wf name="wagner"]
AS: Shoots a beam of fire directly upwards.
LS: Fire characters +40% strength / Power flipper damage +40%

Marina [wf name="pirates_girl"]
AS: Calls a pirate ship to the top of the field and spawns 20 pirate pinballs.
LS: Fire characters +15% HP, +30% strength / Every 20 flips grants Fire characters +5% strength up to 25% strength

Clarisse / Dokkan [wf name="clarisse"]
AS: Explodes upwards, reducing enemy resistances. Scales with enemies hit..?
LS: Fire characters +125% skill damage

Sonya / Sonia [wf name="brown_fighter"]
AS: Deals AoE damage around her, increasing the attack of allies. Scales with buffs..?
LS: Water characters +30% strength / Every 30 combos grants Water characters +12% strength up to 60% strength

Suizen [wf name="onmyoji_boy"]
AS: Grants an AoE field around Suizen that deals damage and poisons enemies.
LS: Water characters +40% HP

Inaho [wf name="fox_oracle"]
AS: Calls lightning around the field, dealing damage and paralyzing enemies.
LS: Lightning characters +40% strength / Fever mode time +30%

Cagliostro [wf name="cagliostro"]
AS: Summons Ouroboros, dealing damage in an AoE and restoring HP.
LS: Lightning characters +10% HP, +20% strength, +60% skill damage

Silty / Shilty [wf name="wind_spgirl"]
AS: Deals damage above and below, scaling with combo count...?
LS: Wind characters +40% strength / While 10 combos or above, Wind characters +60% strength

Philia / Filia [wf name="wind_oracle"]
AS: Recovers HP of all allies and grants floating.
LS: While 60% HP or above, Wind characters +115% strength

Leon / Reon [wf name="mercenary"]
AS: Summons a wind tornado directly upwards and increases strength.
LS: Wind characters +40% strength / Power flipper damage +40%

Nephtim [wf name="ruin_girl"]
AS: Calls down meteorites that deal AoE damage on impact, increasing strength and fever mode gauge..?
LS: Light characters +40% strength / Fever mode time +30%

Razelt / Ralstol [wf name="prince_zero"] (this one seems like a gross mistranslation to me)
AS: Increases Weakness resistance..?, strength, all element resistances, and applies regen for all allies.
LS: Light characters +40% / Whenever Light character heals, grant +4% strength up to 40% and 1.5% Dark resistance up to 15%

Ecreel / 02 / Zero Two [wf name="bodysuit_trooper"]
AS: Deals damage forward and grants all allies penetration.
LS: While 60% HP or above, Light characters +115% strength

Belstia / Bercetia [wf name="dimension_witch"]
AS: Shoots a beam towards enemies, dealing damage to herself.
LS: While 50% HP or below, Dark characters +140% strength

Varren / Verron / Veron [wf name="veteran_hunter"]
AS: Grants an AoE field around Varren, dealing damage. Increases strength and grants all allies penetration.
LS: Dark characters +65% strength