The answer to that question is yet unknown. His eyes were only recently revealed in the Manga, Yana Toboso has not revealed yet how he received his scars. So anything up to this point is purely speculation from fans.
If it is The Undertaker as in wrestling, Michael Myers is stronger. If it is The Undertaker as in Black Butler, then The Undertaker is stronger.
Undertaker calls Ciel by his title 'Earl'.
The Undertaker's first appearance in the manga is in Chapter 6.
The Legendary Reaper, also referred to as Legendary Death is The Undertaker.
That is unknown to everyone except Sebastian and Undertaker.
If it is The Undertaker as in wrestling, Michael Myers is stronger. If it is The Undertaker as in Black Butler, then The Undertaker is stronger.
Undertaker calls Ciel by his title 'Earl'.
The Undertaker's first appearance in the manga is in Chapter 6.
Yes, The Undertaker from Black Butler/Kuroshitsuji is a Shinigami/Grim Reaper, also known as a Death God.
The Legendary Reaper, also referred to as Legendary Death is The Undertaker.
That is unknown to everyone except Sebastian and Undertaker.
The Undertaker wears black because he is the undertaker and they usually wear black
They are very, very, VERY hard to find anywhere. Most of the figurine collections don't feature the Undertaker. (If you can find his figurine which will be very difficult) I would expect it to be expensive.
Black Butler was created in 2008.
Yana Toboso is the creator of Kuroshitsuji/Black Butler.
Black Butler is written by Yana Toboso
Yes it does.