Mifuyu vs. Kagura in an Xbox Live VS. game on the Battleground stage. Boss characters like these are unlocked as you progress through single player.
In a split-screen co-op game, Rikimaru are Ayame peek around a corner to watch for an oppurtunity to strike. The objective of this mission is to kill all enemies without being seen.
In a new single player stage, Samurai Mansion, Rikimaru looks around a corner waiting for an oppurtunity to sneak past the spear-carrying samurai.
In Rikimaru's Bonus Stage, "Through The Portal", he peeks around the corner to watch for a chance to attack or sneak past.