Oh, I liked the "Lucky Charm" part very much! I had never noticed that! And even when Ikkaku lost to Zaraki, you could still say it was luck in a way: Ikkaku was apparently being kind of suicidal, looking for someone who could finally beat him and kill him, and he was lucky that this person turned out to be Zaraki, who not only left him alive but gave him a reason to live! So yeah, lucky charm indeed...