Snowmancy mod will make you feel like Santa Claus in Minecraft. It adds the ability to craft an assistant snowman who will follow you everywhere and can be very useful.
The snowman is an excellent fighter, because he has a fairly large supply of health. In this case, you can give your companion any armor or weapons, and he will use them. A standard snowman loses health in warm biomes, but you can make an improved version out of compacted ice, which will be much more durable.