Here are some pen name suggestions based on your preferences:

Combining Initials:

• Kag: This uses all three initials directly. Consider variations like Kagami (Japanese, meaning "mirror"), Kage (Japanese, meaning "shadow"), or Kagan (of Turkic origin).

• Aka: Using "A" and "K" Consider adding a descriptive word or surname-sounding element. Examples: Aka Thorne, Aka Blackwood, Aka Ryder.

• Gak: Using "G" and "K". Examples: Gak Sato, Gak Stone, Gak Winter.

Genre-Inspired Names:

• For a fantasy setting: Kaelen Grey, Anya Silverwood, Gryphon Blackwood, Lysander Thorne.

• For a science fiction setting: Kai Zenith, Alexia Nova, Jax Garrison, Kira Vance.

• For a mystery/thriller setting: Kestrel Black, Asher Grey, Griffin Stone, Raven Holt.

Names with Neutral Gender Connotations:

• Avery, Blake, Casey, Eden, Jordan, River, Riley, Sasha, Skyler, Zephyr. These can be used standalone or combined with a surname.

Combining Approaches:

• Combine a neutral name with an initial-inspired surname element: Avery Kestrel, Blake Garrison, Casey Thorne.

• Use a genre-inspired surname with a neutral first name: River Blackwood (fantasy), Riley Zenith (sci-fi), Sasha Grey (mystery).

Remember to check if the name is already in use by another author before settling on it. You can also experiment with different combinations and variations to find the perfect fit for your writing style and genre.