Who is riku farther?

Answer 1

We do not know. Many theories have been put forth, however, due to his, Riku's, resemblence to other characters in appearance or personality. Sephiroth, for example, is an unlikely choice due to his part in the story but you can see the basis for this comparison between the two. Even so, Riku's father is either a native of Destiny Islands or someone who moved there. It is unknown whether he is living or dead, etc. We know that Sora has a mother ("Sora, dinner!" or something to that effect from KH1.) yet beyond that we see and hear little of the parents ( or other family members) of the teenagers in the story. We don't even know if Jecht is around for Tidus or if Wakka still has a brother somewhere. Yuffie's father Godo Kisaragi isn't mentioned either.