Designing a new major arcana, help!

So I am in a wonderful and unique position, that with the purchase of an absolutely gorgeous tarot deck comes one commissioned card of my choosing.

I want to add a new card at the end of the Major Arcana, but I am struggling to find what meanings may be "missing" from the standard deck to assign to this card.

Currently I am working with calling it "XXII Liminality" as the boundary between The World and The Fool in the major arcana. Depicted as a kitsune woman standing welcomingly before a Tori gate.

Any suggestions for different or additional meanings, please let me know! I am pretty new to tarot so even something obvious to you might be new to me!