Briar (1G) - Primordian + Rogue

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Briar is a 1 gold unit with two additional traits: Primordian and Rogue. She has a passive where for every percent of missing health, she gains attack speed (AP). For her active, she deals (AD) physical damage to a target and additional damage to tanks.
This makes it so she can be on the front lines and can act as a tank shredder in order for your team to get some additional kills for tech. Place her in front of tanks to be able to take advantage of her ability!
Jinx (2G) - Challenger

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Jinx is a Challenger unit who is meant to be a carry. Her ability is Fishbones! Lets her fire a barrage of bullets based on her attack speed in a cone, each dealing (AD) physical damage to the first target hit. She will likely be one of the main units for killing units in the Anima trait.
Aurora (3G) - Voyager

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Aurora is a 3 gold unit with the Voyager trait. Her ability Hopped-Up Hacks opens a hex rift containing the target, hacking enemies within the hex and dealing (AP) magic damage to each, plus split damage (AP) magic damage split between all enemies hit within the hex rift.
A note for Aurora is that because her damage is split between multiple enemies, she may be good at dealing damage to enemies, but not necessarily cleaning them up. This means her role as a carry will likely need an additional carry to actually clean up and kill enemy units. This also might make her not the best idea as an early game carry due to the split damage.
Illaoi (3G) - Vanguard + Shepherd

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Illaoi is a 3 gold unit with Vanguard and Shepherd making her a tank unit. She has the ability Test of Spirit which allows her to gain an (AP) shield for a couple seconds. Over the duration of the shield, she drains health (AP) from the nearest enemies. Then she slams down, dealing (AP) magic damage to all enemies within 2 hexes.
This makes her the primary tank of the comp who can scale into late game if needed as well due to her 2 hex range.
Fiora (5G) - Divine Duelist + Marauder

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Fiora is the top cost of the trait and is what allows you to get your 5th part of the trait to start healing up 3 health per a fight. Her ability - Perfect Bladework has a passive where every number of attacks she reveals a Vital on the target. If a Vital exists, she dashes to attack it, dealing (AD) bonus true damage and to heal for a percent of the damage dealt.
She also has an active where she reveals VItals on the target and quickly attacks them all. If the target dies, remaining Vitals transfer to the nearest enemy. Upon striking the final Vital, she creates a two hex aura that heals allies with for (AP) over time.