When fielded, choose a character. That character cannot attack or block until Deadman is no longer active.
Does this only refer to one character dice, or all dice of an active character?
Can you name sidekick as a character?
If you can only choose 1 die, than how do you deal with multiple copies of Deadman being fielded and active?
Deadman’s ability refers to a single character die. If it had been intended to apply to all die of a character, it would have been worded like Joker – Clown Prince of Crime (“When fielded, choose an opponent’s character card”.)
As a result, you may use Deadman’s ability on a sidekick character die in the field.
If you field multiple copies of Deadman, each Deadman die may separately chose a separate character die that may not attack or block until the Deadman die that chose it is no longer active.
-The Dice Masters Rules Team