Fluffy-Sama

Ninety-eight percent of the time when we see Lord Sesshomaru, what we see is not him in his true form, but rather the illusionary form he allows us to see, which is a rather feminine quasi elf-like humanoid. In his true form however Sesshomaru is a 40 foot tall white Foo Dog, nicknamed by his faithful follower Jaken: Fluffy or Fluffy-sama.

In his humanoid form his fans refer to him as Sesshomaru, Lord Sesshomaru, Sesshomaru-sama, Sesshoumaru, Sessho Maru, Sessho, Sess, Sesshy, or Sesshie and in his true form they call him Fluffy, Lord Fluffy, Fluffy-sama, or The Fluffy Dog.

(The correct spelling of his name btw is Sesshou Maru Sama [three words; no Lord], meaning "the end of the circle of life" or "the angel of death" though this spelling is very rarely used outside of the original Japanese version of the manga)