Lute

Fanatical devotion and righteous anger
Lute sincerely believes in the heavenly justice system (no matter how cruel it may be). For her, the world is strictly divided into black and white. Angels are absolute good, sinners are absolute evil, deserving no mercy. She doesn't simply follow orders; she takes genuine pleasure in exterminating demons, considering it her sacred duty.
2. Absolute ruthlessness
Unlike some other characters, Lute has no doubts or hesitations. She is cruel, cold-blooded, and sadistic toward her enemies. Charlie Morningstar's attempts to prove that sinners can be reformed evoke nothing but contempt and ridicule in Lute.
Strictness and discipline
Lute is the perfect soldier. She's disciplined and serious (so much so that her name literally translates from English slang as "fierce/stern"), and demands the same from others. She's irritated by any weakness or show of mercy, which is clearly evident in her treatment of Vaggie in the past.
5. Pride and arrogance
Like many celestials in the series, Lute suffers from a colossal sense of superiority. She despises the inhabitants of Adam and considers them dirt under her feet, which ultimately leads her to become blinded by her own self-confidence.
Summary: Lute is the embodiment of the dark, punishing side of Heaven. She is dangerous, determined, and will stop at nothing to destroy what she considers a threat. After the events of the first season finale, her character will likely become even more bitter and vengeful, but with those she loves, she is gentle!