Find the missing character?

The missing character is M.

The sequence is a simple substitution cipher, where each letter is replaced by the letter three places after it in the alphabet. So, A becomes D, B becomes E, and so on. The missing character is the third letter after M, which is P.

Here is a table showing the substitution cipher:

Letter | Replaced by
——- | ——–
A | D
B | E
C | F
D | G
E | H
F | I
G | J
H | K
I | L
J | M
K | N
L | O
M | P
N | Q
O | R
P | S
Q | T
R | U
S | V
T | W
U | X
V | Y
W | Z
Z | A

I hope this explanation is helpful!