Find the missing character?

E
I
A
C

The missing character is A.

The pattern is that each letter is one letter before the next letter in the alphabet.

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

The first letter is A, the second letter is B, the third letter is C, and so on.

The missing letter is the letter that comes after D. The letter that comes after D is E.

Therefore, the missing character is A.