D
E
d
D
T
The series appears to be following a pattern where the letters are increasing in alphabetical order, skipping some letters. The pattern is A (skipping B) D (skipping E, F, G, H, I, J, K, L, M, N) O (skipping P) Q. Therefore, the next letter in the series should be R.
e
Possibly the letters with no lines of symmetry.
d
y....all others come just two letters after every vovels..
K - The pattern is to skip one letter of the alphabet in between each - between D and F there would usually be a "D", between F and H a "G" and so on.
E
The series alternates between letters from the beginning of the alphabet and letters from the end, specifically pairing 'a' with 'z', 'b' with 'y', 'c' with 'x', and 'd' with 'w'. Following this pattern, after 'd', the next letter should be 'w'. Hence, the next letter in the series is 'w'.
Exclamation point
d
It's the letter D of course! Haven't you heard of Jason D?!
Duck Tales was a TV cartoon series in 1987-1990. It begins with the letter D.
grape