haku, "Him" will be "Togo". Accusative case. The model with TaTu has one part in Nominative and another in Accusative to show the relation. That's why "togo" is the grammatical equivalent to "tu", when speaking about cases . While simply "he" is "on".
Edit: So "that" regarding masculine object will be "tot" in the Nominative case. Demonstrative pronouns are used in the group's names. So to make it clear after all explanations: "Togo" - demonstrative masculine pronoun in Accusative case.
*Puff*
