Here are some anti-hero name options based on Kai's powers and personality, exploring different facets of his character:

Emphasizing the Darker Aspects:

• Kai'Ignis: Combines "Kai" with "Ignis" (Latin for fire), highlighting his fiery powers while hinting at a destructive potential.
• Kai'Ember: Suggests a smoldering, dangerous energy, hinting at a controlled but potentially devastating power.
• Kai'Shadow: A simple but effective addition, emphasizing the hidden, secretive nature often associated with anti-heroes.
• Kai'Ashen: Evokes a sense of destruction and the aftermath of his fiery powers, suggesting a character marked by his actions.
• Pyrokinetic Kai: A more descriptive name, directly referencing his pyrokinetic abilities.
• Kai the Unseen: Highlights his telepathic abilities and the potential for manipulation and unseen actions.
• The Velocity Wraith: Combines his speed with a ghostly, elusive quality, suggesting a character who operates in the shadows.
• Kai's Inferno: Positions his fire powers as a central and potentially destructive force.

Emphasizing the Healing/Ambiguous Aspects:

• Kai'Sanctus: A paradoxical name, combining "Kai" with "Sanctus" (Latin for holy), suggesting a conflicted character capable of both destruction and healing.
• The Healer's Hand: A more straightforward name, highlighting his healing abilities but leaving room for interpretation of his motives.
• Kai'Seraph: Evokes a celestial being, but with a darker twist, suggesting a fallen angel or a powerful being using their gifts for questionable purposes.
• The Paradox: A simple, yet effective name that reflects the duality of his nature.

Emphasizing the Energy/Speed Aspects:

• Kai'Surge: A short, impactful name suggesting a sudden burst of energy or speed.
• Kinetic Kai: A more descriptive name highlighting his energy and speed-based powers.
• The Speed Force: A powerful name that evokes a sense of unstoppable energy and speed.
• Kai'Flux: Suggests a character in constant motion and change, reflecting his unpredictable nature.

More Abstract/Mysterious Options:

• Renegade: A simple, yet effective name that suggests a rebellious nature.
• The Catalyst: Suggests a character who triggers events and changes, but with ambiguous morality.
• The Enigma: Highlights the mysterious and unpredictable nature of the character.
• The Charmer: A deceptive name that hints at manipulation and control through telepathy.

The best choice will depend on the specific nuances of Kai's character and the tone of your story. Consider which aspects of his personality and powers you want to emphasize when making your final decision.