"He is a man with sisu."
Translation:Hän on sisukas mies.
It's sort of a rule not to omit third-person pronouns.
Because Finnish verbs are inflected for person and number, subject pronouns are not required, and the first and second-person pronouns are usually omitted in standard Finnish except when used for emphasis. In spoken Finnish, all pronouns are generally used. In the third person, the pronoun is required: hän menee 's/he goes', he menevät 'they go'. This applies to both colloquial and written language.