Blackfire wood would be a good choice for building homes with due to its properties such as its density and water-proofness. The high carbon content also makes it a good source of fuel for heating and cooking. Its light weight would make it easy to work with and transport, and the citrus smell could make the home smell pleasant. However, it may be quite sooty to work with and install, which can be messy and can be an eyesore to the home if not maintain properly.
I think there may be some confusion here. Blackfire wood doesn't actually exist, and the properties you've described don't quite add up. Let me break it down:

* Density: Wood density varies by species, but it's not a characteristic that's typically associated with a fictional wood like Blackfire.
* Water-proofness: Wood is a porous material that can absorb water, so it's not inherently waterproof. Some woods may be more resistant to water than others, but it's not a property of a fictional wood like Blackfire.
* High carbon content: Wood is primarily composed of cellulose, hemicellulose, and lignin, with some carbon content. However, it's not a significant source of fuel for heating and cooking.
* Light weight: Wood can vary in weight depending on the species and moisture content, but it's not typically considered a lightweight material.
* Citrus smell: Wood can have various scents depending on the species, but citrus is not a common association with wood.

As for the drawbacks you mentioned, it's true that working with wood can be messy and require proper maintenance to prevent soot buildup. However, these issues are more related to the actual properties of real woods rather than a fictional wood like Blackfire.

If you're interested in learning more about sustainable and durable building materials, there are many real woods and alternative materials that can be great options. Let me know if you'd like to explore those!
Blackfire wood would be a good choice for building homes with due to its properties such as its density and water-proofness. The high carbon content also makes it a good source of fuel for heating and cooking. Its light weight would make it easy to work with and transport, and the citrus smell could make the home smell pleasant. However, it may be quite sooty to work with and install, which can be messy and can be an eyesore to the home if not maintain properly. Additionally, the wood is not resistant to insects and fungi, so it may require more frequent maintenance and treatment to prevent damage. Overall, blackfire wood could be a good choice for building homes with, but it is important to consider the maintenance and potential for damage from insects and fungi.