Cho’Gath (1G) - Brawler

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Cho’Gath is a Brawler with the ability to deal (Health & AP) magic damage to the lowest health enemy in range and permanently gains bonus maximum health. If Cho’Gath’s ability kills them, devour them and permanently gain maximum health on kill as well.
This makes Cho’Gath a fun unit to play early in the game as well as a great early game unit to star up as well as potentially rerolling him to a 3-star unit.
Lissandra (1G) - Shepherd + Replicator

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Lissandra is a 1 gold unit with 3 traits: Dark Star, Shepherd, and Replicator. Her ability, Dark Matter benefits from all of these. With her ability, she hurls a dagger toward the current target, dealing (AP) magic damage to the first target it hits.
After hitting its initial target or at its final destination, the dagger explodes dealing secondary (AP) magic damage to nearby targets. If the Replicator trait is active, then it does this ability twice.
Mordekaiser (2G) - Channeler + Vanguard

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Mordekaiser is a two gold tank with Channeler and Vanguard trait. His ability is Indestructible where he gains (AP) shield. Each second for the next number of seconds, gain (AP) more shield and deal (AP) magic damage to adjacent enemies. When the ability ends, consume the remaining shield and heal for a percent of its value.
Mordekaiser will likely do a lot more in the early game than in the late game where in the early game his shield is less likely to pop and the health refund will do a lot for him. In the late game, the shield likely pops and the health refund does not do much for him.
Kai’sa (3G) - Rogue

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Kai’sa is a Rogue with a passive and active ability in Bullet Cluster. For the passive, on takedown, she gains mana per a kill. For her active, she fires missiles in a hex radius around the current target, dealing (AD) physical damage for each missile.
Karma (4G) - Voyager

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Karma is a Voyager where she gains damage amplification. With her ability, Singularity, she gathers the force of a black hole, dealing (AP) magic damage split between the target and a number of enemies closest to them. The target takes an additional secondary (AP) magic damage.
Jhin (5G) - Eradicator + Sniper

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Jhin is a Sniper with Eradicator which means enemies have 14% less armor and magic resistance which essentially makes him shred and sunder on a stick while being a legendary unit. His ability is Space Opera which has a passive and an active ability.
For the passive, Jhin has a fixed attack speed which converts every bit of bonus attack speed into bonus attack damage. The active is to summon spectral hands that fire alongside Jhin for the next number of attacks.
Each hand deals (AD) physical damage per shot and removes armor. The final shots deal more damage and pierce through the most enemies in a line, dealing reduced damage per a target hit.