Where's C.O.D.E. Agent 1?

So Far as far as C.O.D.E. Agents we have:

Zero: C.O.D.E. Agent 0

The Lady: (former) C.O.D.E. Agent 2

Lord Three: C.O.D.E. Agent 3

Kensei Odaka/NOX: (Former) C.O.D.E. Agent 4

Lord Five: C.O.D.E. Agent 5

Kureha Miyamoto/Lord Six: C.O.D.E. Agent 6

Baku Yorozu/Zeztz: C.O.D.E. Agent 7

We have Zero revealed; and Agents 2-7 Known. . .

There's Only ONE Agent we know nothing about; C.O.D.E. Agent ONE

Whatever happened to Agent ONE?!

Did Agent ONE Die during a Mission; or did they defect like Agent 2, Agent 4, and NOW Agent 7 have;

since So far the only KNOWN Loyal agents to C.O.D.E. are Zero, Lord Three, Lord Five, and Lord Six

Is Agent 1 Going to be an endgame antagonist; a Movie-exclusive Antagonist; or Just A Complete & utter No-Show for the entirety of Zeztz?!