My nation is supposed to use a language I'm half-finished with and will never get the time to complete, and uses a mostly-unmodified Latin alphabet.
Edit: Hariko makes me feel inadequate, so here is said alphabet-
A, B, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R, S, T, U, V, W, Y, Z.
Vowel sounds are always short, C is replaced by K and S, and X is EKS or KS as appropriate.