Find the missing character?

In each row, add the numerical value of the left and right hand letters together and write the letter with the reverse alphabetical value in the center. So,

L + H = 12 + 8 = 20 = T = Reverse of the T = G.
C + A = 3 + 1= 4= D = reverse of the D = W

Similarly,
J + O = 10 + 15 = 25 = Y = Reverse of the Y = B.
Missing Character = B.