Find the missing character?

The missing character is $\boxed{\text{Q}}$.

The other three characters, $\text{A}$, $\text{F}$, and $\text{R}$, are all in the set of letters that appear in the alphabet twice. The letter $\text{Q}$ is the only letter in the alphabet that does not appear twice.

Here is a table showing the number of times each letter appears in the alphabet:

Letter | Number of times it appears in the alphabet
——- | ——–
A | 2
B | 2
C | 2
D | 2
E | 3
F | 2
G | 2
H | 2
I | 3
J | 1
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