Bokkuko (uses "boku" as personal pronoun).
Speculated by fans to be a genderswapped alternate universe version of famed Japanese jockey Take Yutaka because of their similar backgrounds (ie. both Yutaka and Fumino having well-known fathers who are/were in the same business). Like Yutaka in real life, Nase Fumino also insists on having Super Creek assigned to her. Shifting "Na" and "se" each one column up in the Japanese syllabary also yields "Take".