Between the factions, there exist friction or even hatred.
Examine the underlying schematic in more close details. What do we learn from this?
The Pyromaniacs
The Pyromaniacs trust in their brain power to unlock and harness the magic powers that are abundantly available on Nooblies. This however comes with hefty price. Because of mostly training their brain to be able to handle this raw resource, physical prowess is lacking severely as well as understanding other more to 'earth' like concepts. Because of this, they really loath them Mad Scientists.
Because the magic power is a raw natural resource, the Tree Huggers are seen as a friendly group, that can help overcome their own awkwardness when it comes to enduring physical activities.
However, sometimes the way those Religious Fanatics think about having powers that closely resembles a deity is not always a blessing.
The Tree Huggers
The nature lovers don't care much for magic. For them it's about life, living things, that evolve, based on the principle of the GCS (aka Generative Cell Sequencer) as a part Gaia. They trust that the GCS will find a way to get things done or fixed or changed or whatever. This is the total opposite of those Religious Fanatics! They have less use for brain, but are more in tune with their physical being training it to do the will of their so called 'Keepers'.
Since GCS is also responsible (in their mind) for the magic, helping the Pyromaniacs, and getting aid from them, comes naturally. This in contrast to those Mad Scientists who think that everything could be explained using all kinds of rules and laws; but nevertheless, their trinkets are sometimes worth 'overlooking' that particular trait.
The Mad Scientists
These are those who like to use their brain and hands to fabricate, engineer, reverse engineer, break, build, tear down anything they can. And they will, damn the consequences! They have learned about applying logic, mathematics and all other kinds of necessities used in tinkering. Hence, their brain is more developed as well as their limbs that are needed for tinkering with all kinds of materials. For them, abusing the brain to limit it to just one major function and in a lesser extend for normal day living is an abomination.
Helping the Religious Fanatics seems also logical. Because without those higher powers, how would it be possible to understand the world around us; and being able to use it for our benefit.
This is somewhat in contrast with the Tree Huggers, who believe that nothing is pre-arranged. There is also something to say for that, because still not everything can be explained.
The Religious Fanatics
The Religious Fanatics believe in all their might, there are higher powers, that dictate every action, every outcome and everyone's destiny. Therefore, those degenerate Tree Huggers with their 'Gaia will solve anything by itself' attitude are heretics and should be wiped of this beautiful designed planet.
For that, working with the Mad Scientists seems to be the will of the 'Keepers' as they have bestowed upon them they knowledge how to use these worldly materials. Collaborating with the Pyromaniacs can often be a very successful undertaking, however they hunger for power, nearly becoming a deity, is also threatening.
The Neuters
The Jack of All Trades, but Master of None. How well described they are. Is it they can't or won't choose? In any case, they're not hated, nor loved by any of the before mentioned factions.
This makes them excellent traders, since for example, Tree Huggers will rather die than selling something to a Religious Fanatic; similar, a Mad Scientist would cut of their hands before allowing some Pyromaniac abuse their painstakingly handcrafted trinket.
However, this kind of 'Freedom' comes, obviously, with a cost. The Neuters are not trusted by any other faction. They might get a status of 'Friendly', 'Honored' so they might get more bonusses (like lower prices when buying, higher when selling) or even the opposite 'Hostile', 'Agressive', in which case the bonusses are turned into penalties.
A Neuter may decide to fully join a faction, but once the choice is made, there is no going back. After the joining, the ex-Neuter may then reap all the benefits and also suffer from the consequences.