She is a crane who transforms herself into a Japanese maid. She serves her master and appears to think of him as the most important aspect of her life. Her master is unknown (rumored to be Andrew), but is likely to be the player him/herself as she often bows and speaks to the player before and after her fights.
She fights with two butterfly swords and relies on her speed for close ranged combat. She can also double jump. Several of her moves hint to her original form as a crane such as her projectile (a white feather) and her normal fighting stance. The most obvious reference is her POW move, where she grabs her opponent and, behind shoji doors, disrobes and physically beats her foe. Her silhouette during this sequence briefly changes into a crane.
Iroha is a very popular character in Japan, and stars in her own mobile game called Maid by Iroha. Another game based around her is currently scheduled for release on the Nintendo DS. She makes another appearance in the dating sim Days of Memories: Oedo Love Scroll. Recently, she has also been added to a roster of usable characters in the Queen's Gate series, which is an extension of the fantasy game series, Lost Worlds. She also has several different figurines, hard cast and otherwise, made in her image.