Tiwa is a Yoruba vigilante and confidant of Solomon, who has kept bounty hunters out of Nigeria and has hunted criminals, terrorists, and corrupt politicians who victimize the Nigerian people. She acts more in line as an assassin though not for pay.  Her voice is deep, deadpan, and assertive. She's Yoruba by ethnicity, which may be required for a Nigerian, especially with a Yoruba accent to apply for this role. You can refer to Amanra from Age of Mythology to know that's a good reference for the role.