Erishisu: (that's how its pronounced, sometimes romanised as Elisiss)  A brown haired green eyed elf girl who follows Yohrun around.  By using the amulet at her neck, she is able to transform into Shiida, a powerful amazon with magical powers.
In the anime, she has the power to heal (even those near death) but is otherwise just cute and vulnerable.  The manga version of Erishisu is more formidible, sometimes arming herself with a high temperature plasma sword.
Her sister is Enefea the magical white mountain lion.