arknights
spot (arknights)

13
Spot is a 3★ Guardian Defender who specializes in Defense and Healing (obviously). As a Guardian Defender, Spot can block two enemies by default, or three when promoted to Elite 1, and has innate RES, but with lowe HP and DEF when compared to Protector Defenders. As with most Defenders, Spot has a very short attack range of the tile he is on.
Being a 3★ Operator, Spot cannot be promoted to Elite 2, making him unable to keep up with Guardian Defenders of higher rarity. On the flipside, Spot is easy to raise, both in levels due to only requiring a decent sum of  LMD and materials, and in Potential especially through recruitment (where he is a common sight when the player picks the Defender/Defense and Healing tags).
Spot's skill, Secondary Healing Mode, makes him heal friendlies in the surrounding tiles instead of attacking enemies and buffs his ATK, but increases his attack interval while active. His talent, Smoke Installation, grants the friendly unit healed by Spot with Secondary Healing Mode a small chance to dodge Physical attacks for a short time. When both are used together, Spot can maximize his and other friendlies' survivability.
Spot's first base skill, Skillful Craftsman, increases the byproduct rate of any material processing by 50% when he is assigned to one. His second base skill, Metalwork α, increases Factories'  Pure Gold productivity by 30% when he is assigned to one.
Overall, Spot is a basic Guardian Defender who can fill the said role well until his superior counterparts of higher rarity are available. Still, he can still perform just as well especially due to his ability to bestow temporary evasion on his allies.
Friends: Gummy - A defender and healer who complements her abilities.
Liskarm - Another defender who provides additional support.
Red - A fast-hitting operator who helps eliminate enemies.
Pramanix - Provides magical and healing support.
Silence - Can silence enemies, helping control the battlefield, arknights