In Suspects: Mystery Mansion , characters are usually unlocked via the using one of two currencies: Gems (premium) or Coins (free, earned by playing).
If the helicopter loads but has black textures, you likely need to install the Microsoft Visual C++ Redistributable 2010-2022 pack and DirectX 9.0c (even if you have DX12). Freeware models often rely on older code.
He looked down at his hands on the controls, the same hands that had once built toy helicopters of rubber bands and bobbins in Kiev. The dream was no longer an idea; it was a physical weightlessness. The Captain was finally, truly, in flight.