Is Hydrazine a solid, liquid, or a gas? I've looked it up and there's no straightforward answer...

The answer is yes!. You don't mention a temperature so depending upon the temperature it can be anything. The melting point is 2 Celsius and the boiling point is 114 C. . So below 2C it is a solid, from 2 C to 114 C it is a liquid (20 C is room T) and above 114 C it is a gas.