Since there are a few custom characters already, I'd like to suggest one since I don't have the know-how to make them myself.

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Nova (Starcraft)[starcraft.fandom.com]
Species: Human
Gender: Female
Age: -REDACTED-
Specialty: Sniper

Character appearance link: https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=1131360448

Voicepack link: https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=1130832654

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Ideas for her perk tree

[Rank 1] Recruit

- Squadsight: Grants Nova unlimited attack range and Overwatch range, but her Overwatch has a very narrow cone of fire. However, Nova receives an Aim penalty towards enemies within 3 tiles of her.

[Rank 2] Deputy Agent

- Ghost Protocol: During the breach, Nova cannot be targeted by the enemy. Available once per mission.

[Rank 3] Field Agent

- Deadeye: Take a shot with a small aim penalty for a significant damage boost. 3-turn cooldown.

- Psi Shot: Fire a shot that stuns the target. Deals reduced damage and cannot crit. 3-turn cooldown.

[Rank 4] Special Agent

- Surgical Precision: Reduces aim penalties from cover by half, and Nova's shots can no longer Graze.

[Rank 5] Senior Agent

- Holo Decoy: Nova can create a Holo Decoy at a targeted location. Each decoy lasts 1 turn, and enemies will prioritize it with their attacks. 5-turn cooldown.

- Executioner: Nova has increased Aim and Critical Chance against enemies that are Disoriented, Stunned, or otherwise crowd-controlled.

[Rank 6] Principal Agent

- Serial: Activate to have killing shots refund their action cost.

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Training Bonuses

Level 1 Training - +3 HP

Level 2 Training - +20% Crit Chance, +1 Mobility

Level 3 Training - +3 Crit Damage, +10 Aim

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There don't appear to be any snipers in Chimera Squad, so this could help introduce one, especially if someone is able to introduce appropriate perks.