Poppy (1G) - Bastion

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Poppy’s ability: Huddle Up! Gives her (AP) shield for a duration of seconds. For the duration, allies within two hexes gain (AP) armor and magic resistances.
Her Meep Bonus is Meeps grant Meep Shield (AP) to the nearest allies for a number of seconds. This makes Poppy an early game tank where she also pairs well with Rammus who is also a Bastion.
Veigar (1G) - Replicator

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Veigar has one of the best named abilities: Meepteor Shower. Veigar calls down a Meepteor on the target that deals (AP) magic damage. With his Meep Bonus, additional minimeeps are called down on nearby targets dealing (AP) magic damage each.
Meepsie (2G) - Shepherd + Voyager

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Meepsie has the ability of Meep Impact where Meepsie heals for (Health & AP) health over a duration of seconds. Meepsie then slams the target, dealing (AP) magic damage and knocking up for a number of seconds.
The impact creates meepwaves that deal a percent of these effects in the target’s row. The Meep Bonus is: Meeps water Meepsie’s flower, which increases all incoming healing and shielding.
Gnar (2G) - Sniper

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Gnar has the passive ability Slingshot Maneuver. For his passive, every 5th attack, Gnar launches a returning boomerang at the target that travels two hexes past the first enemy it hits.
It deals (AD & AP) physical damage, reduced by damage reduction percent per hit. The Meep Bonus is Meeps attack alongside Gnar, dealing (AD & AS) physical damage per second.
Fizz (3G) - Rogue

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Fizz is a Rogue with the ability Meep Bait. He dashes through the current target, dealing (AP) magic damage. Every third cast, he summons a Mega Meep after a delay, briefly knocking the target up and dealing (AP) magic damage in a one-hex radius, reduced by fall off damage per hex from the center.
Corki (4G) - Fateweaver

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Corki is a Fateweaver with the ability Asteroid Blaster. Corki strafes to a nearby position, unleashing missiles split between the target and all enemies within two hexes. The missiles deal (AD) physical damage with a chance of firing a mega missile that deals additional (AD) instead.
With the Meep Bonus, every meep gives a cooldown which launches an Explosive Meep at the target, dealing (AD) physical damage in a one hex radius on impact. With the Fateweaver luck bonus, it checks twice and takes the better outcome.
Rammus 4G) - Bastion

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Rammus is a tank with the Bastion trait. His ability Gravitational Spin gives him (AP) shield for a duration of seconds. Then, he strikes the most enemies in a three hex line, dealing (AP & Armor) magic damage.
The Meep Bonus reduces the damage of incoming attacks by flat damage reduction. After being attacked a number of times, he deals passive magic damage based on armor in a two hex radius.
Bard (5G) - Channeler

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Bard is a Channeler who benefits from mana regeneration. He has the ability Ultra Friendly Object. With this ability, he summons a flying saucer over the current target that lasts for anumber of seconds. Each second it deals (AP) magic damage per a second to the target plus split damage per a second (AP) magic damage between all enemies within a determined hex range.
The saucer deals increased damage to tanks. If the enemy under the UFO dies, Bard has a chance of abducting them to create a 1-star copy of the unit on your bench. The Meep bonus gives Bard on combat start, granting the nearest Astronaut allies an additional Meep.