Ko-Ou Ken

Ko-Ou Ken (Gleaming Tiger Fist) is one of the signature moves of the Kyokugenryu Style, making its initial appearance in the Art of Fighting series and being a fixture of every Kyokugenryu practitioner ever since.

Description
The user swings their arm out and either throws out a surge of ki energy, or a full projectile depending on the user and the game.

In most cases, however, the move is almost always a short-ranged projectile. Which is often a very handy poke to use in the neutral.

Strategy
Not exactly a zoning tool, but still solid enough for the neutral, this is your go-to poke when at range.

For Ryo's version, in KOF XV in particular, not only is the EX version still advantageous on block as it was in XIV, but it's also now a full-screen projectile that knocks down on hit, adding a layer of pressure to Ryo's gameplan.

In Yuri's case, she can hold either punch button (or both for the EX version) to throw out a rather quick and damaging full-screen projectile (tied with Ventose as the most damaging, in fact). Though she's liable to be hit as she's charging up the move, making both positioning and timing cruicial to make the best of it.

Trivia

 * As one might guess, this is to the Kyokugenryu practitioners what the Hadoken is to the Ansatsuken users of the Street Fighter series.