Proper gods have no nemesis. They need no nemesis. They are self-sufficient and harmonized within themselves.
That said, some proper goods exist as a form of balance between various aspects. The zen-taoists have the yin-yang (which is not a personal god but a direct pantheistic balance/transformation in the universe). The australian aboriginals have their Two Brothers. The pre-monotheist indo-europeans (& modern neo-pagans & Wiccans) have the God & Goddess, or Frer & Freya in the north. Religions of life tend to work like this. Only spiteful, warlike, unenlightened little semi-gods have a nemesis, because their support is based on hatred & division.
For examples of balance shown by Pastafarianism, you could illustrate the 4-part aspects of the FSM itself:
1) As the "Foundation," you have the Core Meatballs, representing the meaty matters of reality, the basic facts of the Cosmos/science. It takes much learning and practice to understand these things as best we can, and so we should continue learning the lessons of reality throughout our lives. Learning builds our core abilities.
2) Then there is the "Motivation" of the Holy Sauce which coats and flavors the total, the tasty experience of life which is infinitely variable in its recipe and enhances our joy of existence. It is the lifeblood that drives us, looking for better ways with deeper rewards. This reminds us that life is a gift bearing more than mere survival, encouraging also the love and determination to strive for excellence in our own personal recipe of self.
3) As the "Expression" of FSM, around the core there are the tendrils of Noodly Appendages, twirling and expanding, which show how we and all things are connected as we reach out to the universe with our actions. This also shows how inspiration connects what is known to all that is possible. The Noodles are flexible, varying in their positions, because at any given moment there are many options, many paths we could take. It is up to us to find inspiration as it is available and let its truth touch our lives.
4) Finally (sometimes overlooked), there is the "Interaction" aspect of Flying. As FSM flies through the cosmos, it views & reviews all its works and their outcomes. This reminds us to consider our own actions and all we have touched with our own life. What do we bring to the world? What can we improve? What can we learn from our successes, mistakes, and experiences? Where is the next discovery, the next chance to become a more harmonized part of our universe? In order to navigate life, we need to have these questions alive/moving/growing/searching within us.
These principles (Foundation, Motivation, Expression, Interaction), found within The FSM, are similar to Medicine Wheel & its equivalents among other traditions of life religions. They map onto the 4-circle Harmony of Shamanism that is depicted in my avatar here. Thus, FSM is a proper god and needs no opposing nemesis for us to be enlightened by FSM's ways. Where Harmony lives, no division nor hatred is needed to maintain it. These are lessons that would be well learned by all children of the world.
--from a shaman of shadows
In case you didn't realize it, I DO have a sense of humor. How about you?
"I will not fear. Fear is the mind-killer... I will face my fear. I will let it pass over and through me, and when it has gone, only I will remain." --The Bene Gesserit
"Time is a spiral. Space is a curve. I know you get dizzy, but try not to lose your nerve." -- Neil Peart
"I'm not in the ship. I am the ship." -- River Tam
"The truth is simple. It's the lies that get complicated." -- me
"No matter where you go, there you are." --Buckaroo Banzai