The following is a list of every imprint currently in the Duo mod (as of 1.0.4.0), as well as a description of the bonus Imprint passive they come with. Beware: spoilers.

Party Members:
Companions can be imprinted, but their imprint ends early if they later join your party.

• Astarion: Can sneak attack once per encounter.
• Gale: Can use Arcane Recovery to restore a Tactic Point once per day.
• Wyll: Can benefit from Dark One's Blessing once per encounter. Only adds temporary hitpoints equal to Charisma bonus, as your partner will not have a Warlock level.
• Lae'zel: Can Action Surge once per day.
• Karlach: Can Rage once per day.
• Shadowheart: Can Turn Undead once per day.
• Minthara: Can Divine Smite once per encounter using Tactic Points.
• Jaheira: Can wildshape using Tactic Points once per day.
• Minsc: Can summon Boo.
• Halsin: Can wildshape using Tactic Points once per day.
  

• Shar: Has a toggleable aura of darkness that blinds people within 30ft, and is herself immune to darkness. Can be imprinted from her idol, but only once in a playthrough.
• Vlaakith: Gains a spell to channel the power of Vlaakith for 5 turns. The adventuring partner grows in size, makes all attacks at advantage, and can cast spells and use tactics without spending tactic points. However, they instantly die when this effect ends. Can be imprinted from her portrait in the Creche, but only once in a playthrough.
• Ellyka: Ignores difficult terrain penalties and can't have movement speed reduced.
• Sazza: Can cast Sanctuary on herself.
• Barcus: Can throw Bombs for tactic points.
• Rolan: Can cast Rolan's Mage Armour, which improves by +1 for each Act you've played.
• Lia: Can use the Taunt tactic.
• Cal: Adds +1 to your Persuasion.
• Nettie: Can shapeshift into a blue jay.
• Gut: Can cast Ray of Sickness.
• Dror Ragzlin: Can use Martial Weapons and Medium armour.
• Rugan: Gains the Bounty tactic.
• Volo: Can cast Guidance.
• Lakrissa: Has a toggleable passive that pays you gold when you crit, but you lose gold when you miss.
• Dammon: Is proficient with heavy armour.
• Gandrel: Has advantage against Undead or Monstrosity creatures.
• Roah: Can cast Expeditious Retreat.
• Abdirak: Benefits from Lovitar's Blessing.
• Omeleuum: Can levitate.
• Bernard: Is a construct immune to lightning damage.
• BOOOAL - Imprinted from his altar or corpse: Has advantage against bleeding creatures.
• Pooldripp: Can cast either Bane or Bless once per day.
• Nere: Can use his Shield of Screams ability.
• Ghustil Stornugoss: Can use Lay of Hands, flavoured as a medicine kit.
• Youth Varrl: Can use Second Wind.
• Zevlor: Can Searing Smite once per encounter.
• Alfira: Can use Bardic Inspiration with Tactic Points.
• Aradin: Whistles and points out Buried Treasure.
• Kagha: Can poison her weapons.
• Ethel - Imprinted from her human/hag form, or her corpse as long as the Tarnished Amulet is being worn - Can create and throw potions once per short rest.
• Gribbo: Can throw a net.
• Andrick: Is branded.
• Brynna: Is branded.
• Crusher: Has the Mobile Feat.
• Blurg: Grants expertise in Arcana, Religion and History.
• Dhourn: Has advantage on Saving Throws while obscured.
• Thrinn: Can Click Heels.
• Elminster: Gains an extra Tactic Point.
• Ko'kuu: Resists acid and ignores acid surfaces.
• Ptaris - Can also be imprinted from his egg - Can switch between Nature/Nurture stances, adding/subtracting 2 to his Attack/AC.
• Florrick - Grants you the Reposition Tactic.
• Manifestation of the Mad Monk - Imprinted from the sentient amulet - can cast Tasha's Hideous Laughter.
• Thulla: Can Click Heels.
• Quil Grootslang: Can sing a song once per adventure that grants everyone the benefits of a long rest.
• Mayrina - Can only be imprinted in Act 3 - Can summon Connor.
• Oskar: Can cast Color Spray by throwing paints.
• Wulbren Bongle: Has advantage against Constructs.
• Linsella: Can cast Dominate Beast once per day.
• Balthazar: Can cast Soul Cage, a variation of Resiliant Sphere, once per day.
• Lyrthindor - Can be imprinted from any rat in the Gauntlet of Shar - Immune to blindness.
• Dame Aylin - Can't be imprinted while in the Shadowfell - restores 1hp when downed.
• Isobel: Can cast Globe of Invulnerability once per day.
• Arak Oblodra: Can teleport between pools of blood, gaining advantage on attacks when she does.
• Disciple Z'rell: Can cast Black Hole.
• Marcus: Can fly.
• He Who Was: Can misty step.
• Wardog Squire: Gains Pack Tactics.
• Lassandra: Has the Sentinel feat.
• Mizora: Can shift between human and cambion form.
• Art Cullagh: Can use Bardic Inspiration with tactic points.
• Lucretious: Can summon Dribbles the Clown as a zombie, which gets stronger the more clown parts you had when you summoned him.
• Korrilla: Can cast Hex, and her Hex works for your attacks as well.
• Voss: Can cast Wall of Fire once per day.
• Lorroakan: Can summon a Myrmidon that goes away after combat ends.
• Viconia: Is immune to blindness and being surprised.
• Nocturne: Has Devil Sight.
• Ravengard: Can use a Rally Cry to give allies 10 temporary hitpoints once per day.
• Fytz the Firecracker: Can throw Firecrackers that have a low chance of blinding.
• Sebastian: Can use Vampire bite.
• Geraldus: Has the Alert Feat, but not the initiative bonus due to being a partner.
• Pritt Yellowbreath: Adds +1 to your Intelligence and gives you proficiency in intelligence saving throws.
• Angry Mar'hyah: Has advantage against beasts.
• Exxvikyap: Gives +2 to your Persuasion skill.
• Sorn: Can cast the Suggestive Spell, which is like Command, but Suggestive.
• Nym: Can cast the Suggestive Spell, which is like Command, but Suggestive.
• Hoots: While imprinted, if anyone in the party drinks alchohol, triggers Hoot's Hooch.
• Breva: You regain full hp when you Short Rest.
• Fane - Imprinted from Marvin the talking skull in Wyrm's Rest prison - Can shapeshift at will.
• Captain Grisly: Can cast the Captain's Order's Spell, which is like Command, but Piratey!
• Devella: Gives advantage on Investigation checks, and can cast See Invisibility once per day.
• Tusgront: Gives +2 to your initiative
• Dolor: When scoring a critical hit on a humanoid, can paralyse that creature.
• Figaro: Can turn Tactic Points into Dyes.
• Henk: Can turn Tactic Points into Camp Supplies.
• Adrielle: Has Advantage against Fey Creatures.
• Golbraith: Has Advantage against Illithid creatures, and tadpoled creatures.
• Lora: Has the Defensive Duelist Feat.
• Glitterbeard: Can use Blood Money once per day.
• Helsik: Can cast Flesh to Gold.
• Rion: Has the Dual Wielder feat.
• Jord: Can cast Plant Growth and Entangle once per day.
• Harvard Willoughby - Sort of. You'll see what I mean.
• Redhammer: His attacks leave pools of oil.
• Mortach Gracie: Can cast Spirit Guardians (Radiant) once per day.
• Lady Jannath: When downed, is brought back with 50% hp but possessed.
• Tarhun Mnemonis: Can cast Mage Hand with Ledgermaine.
• Zanner Toobin: Blind, but can take control of a Steel Watcher once per day.
• Mystra - Imprinted from her statue - Gives an additional two tactic points.
• Allandra Grey: Her attacks make pools of water, and she can teleport out of Water pools.
• Aelis: His attacks leave behind grease, and he can cast Burning Hands once per day.
• Qudenos: Can cast Wall of Fire once per day, is immune to fire damage.
• Ninefingers Keene: Can gain a second bonus action for the duration of a combat, once per day.
• Uktar: Can cast Knock with tactic points.
• Hope: Starts combat with Death Ward.
• Duke Belyne Stelmane - Imprinted from the bloody bed in her parlour - Grants proficiency with Wisdom Saving Throws.
• Raphael: Can shift between Human and Cambion forms.
• Naaber: Can't roll criticals, either hits or misses, and his stats are set to 10 minimum.
• Orpheus: Can use Tactic Points as Ki points for Flurry of Blows and Stunning Strike.
• The Dark Urge - Imprinted from the body in Bhaal's Temple. Tav only - Can become the Slayer once, but disables Imprinting forever after.
• Ansur - Imprinted from his skeleton - When brought to the elder brain battle, something will happen.
• Sarevok: Can use the Evil Bhaalspawn powers from BG1/2 (Inflict Wounds, Fear, Vampiric Grasp).
• Cazador: Can use Vampire Lord bite, which has a chance to charm.
• Ketheric - Can also be imprinted from his Netherstone - Has 20 Strength.
• Orin - Can also be imprinted from her Netherstone - Has 20 Dexterity, and can Shapeshift at will.
• Gortash - Can also be imprinted from his Netherstone - Has 20 Charisma.
• The Emperor: Immune to Psychic Damage, has advantage on Intelligence, Wisdom and Charisma saving throws.