Cool, cool! I'll be using my Sasori bio ("The Magician" in my signature)
Sasori of the Red Sand entered the training grounds wearing his Akatsuki robes, slightly unbuttoned. One could see his pure puppet body underneath, with a flash of his "core", his essence.
Upon seeing Marceline, he sat cross-legged across from her. His eyes and expression seemed uninterested and perhaps even cold, but his focus was intense.
"Good, you're here early. I dislike waiting. I'm Sasori, your sensei for today. Introduce yourself." he said rather matter-of-factly.