Concerning the curses, there is an infinite degree of malleability that comes with the curse for those who have put effort into mastering various aspects of the curse.
Pedomorph Curse -
Those who have age-regressed to childhood are, in the norm, relatively stuck between the ages of toddler (3 years) and pubescent age (13 years). This does create a great degree of complexity for them, in particular their social and intimate lives. It also enables them to act as superlative spies in distant lands, since no one pays great heed to children. Altering their appearance within that ten year range is not terribly difficult, it just takes some thought and concentration. They will generally shift to a default age, which can be different for every individual, but usually around the apparent age of nine years.
Psychological traumas may alter this default aspect, and situations of great stress will tend to make many who do not have a firm control over their curse to shift to and remain at that default age.
By and large pedomorphs do not have any ability to alter their appearance via the curse.
Some very few who have prodigious wills and through considerable effort are able to push their appearance beyond the bounds of the curse. They can appear to be fully adult for a time. This is an extremely difficult ability to learn, and one that requires utmost concentration to maintain, but it is possible. Likewise, for whatever purpose, they can even take on the aspect of newborns for a time.
Animorph Curse -
Those who have been cursed into the forms of animals can run the range from typically encountered species worldwide, with a greater number of them becoming species native to the region of Metamor or their origin regions (those from the south will tend to aspect species from that region, ect. It is not known why this occurs, but sages and mages both believe there is a great deal going on within the subject to direct this course - somewhat). Animorphs have the greatest difficulties beyond the immediate region of Metamor and kingdoms that border it because they are no longer able to appear human whatsoever. While some are able to travel abroad, they generally do so under the aspect of their newly assumed species either to blend in (and unfortunately expose themselves to be hunted by the unknowing), or with humans who are their 'handlers'. Many encountered abroad are, unfortunately, not beyond the bounds of Metamor of their own free will. Due to the limitations of their new appearance more animorphs remain within Metamor's borders than any other aspect of the curse.
In general animorphs have two aspects of their curse; a bipedal, anthropomorphic form most familiar within Metamor, and the normal form of their new species. Hands tend to be the most markedly limited; as hooved animals such as deer and horses, typically have fewer but thicker fingers terminating in small hoof-like tips. This affects their fine manipulation, but most have learned to manage this shortcoming. Dentition remains within the range of their new form but, oddly, their digestive system is almost unaltered from its human state. Herbivores can consume a varied, omnivorous diet and carnivores are perfectly capable of consuming a very vegetative diet if they desire.
Typically they default normal aspect is this bipedal form, with varied levels of humanesque appearance. Some appear to be little more than humans with modest animal traits, while others are little more than animals with enough human traits to get by - hands and speech, typically.
For some, there is a greater ability to manipulate their forms than with any other curse. Small species, such as rodents, have a difficult time becoming as small as their natural counterparts but - with effort and practice - can do so for a time. Large species can assume their natural forms with much greater ease. Equines, bovines, and other contemporary working animals have turned this to their advantage in business.
Further, others have put effort into melding the two aspects. They've trained themselves to combine the four limbs and strength of their new form with the arms and hands of their former human selves. They have learned how to become 'taurs - a quadrupedal meld of both forms. Many can maintain this form for lengthy periods of time without needing one hundred percent concentration, though it is draining on them over time.
Many animorphed keepers, especially early in the establishment of the curse, could not handle their new changes mentally. Some become trapped in their new form, but retain some semblance of their intelligence and personality, while others are no more than what the curse has made them into, both mind and body. Others are able to assume their bipedal form, but revert to their animal nature under stress.
In particular to animorphs: When assuming a 'feral' form - the pure aspect of their new species - they must adorn themselves to indicate that they are more than a random, purely normal, animal. Typically it will be a scarf, beads, braids, fur dye, or bells that mark them as 'touched by an intelligent hand' as a farmer might a domesticated deer or wolf.
Transgender Curse -
Those who have been changed from the gender of their birth to the opposite gender (and gorgeous representative thereof) are most easily able to blend into the current human world. They are those most likely to travel beyond Metamor on their own to carry on with their new lives. It is one of the most desirable of the aspects of the curse because of this reason. In particular among females who come to Metamor from more male dominated cultures. Metamor is, and has been, a far more egalitarian culture in respect to gender roles and that has become even more apparent since the curses.
In general, transgender morphs appear as very good looking members of their new gender. This, however, seldom translates mentally and can cause a good bit of social and cultural problems as the person comes to terms with their new gender. Some stalwartly refuse to accept what they have become and comport themselves as they did prior to the curse. Others have problems with their new intimate urges; they still desire the gender that they preferred before the curse. For those who were married before the curse this carries an especially heavy burden, especially if they are devout members of the Ecclasia.
As with the other aspects of the curse, there are a variety of abilities within reach of those who are willing to put forth the effort to practice them. The easiest is the alteration of their physical appearance. Transgenders are able to tone down the stunning good looks and often powerful desires caused by the curse. They can appear quite normal if they choose, and over time this tends to become their default appearance. Some can even make themselves rather ugly, for whatever reason.
Others, however, have taken this to an entirely different level. As with the alteration of age among the pedomorphs or 'taur and size alterations practiced by the animorphs, transgenders can do many things within the bounds of their new curse. Many are able to alter their height and weight with little exertion of will, and can maintain these alterations for considerable periods unconsciously. Others can further this with alterations of hair color and eye color (often completely unconsciously - which might explain why they have such changes in various archival texts) as well as general skin tone within that normal for their race. In combination this makes them superlative spies, both for Metamor and unfortunately against it at times as well.
The greatest, and most difficult, of these alterations is that to their very gender. With considerable will, effort, and practice gendermorphs are able to assume their previous genders for a time. This exacts a considerable toll on their body if maintained for long, and requires almost constant focused concentration. Unfortunately this does not return to them the biologic nature of their previous genders. Those who were once male cannot sire children this way, and those who were once female cannot bear children.
The Curses and Faith -
This is a complicated and tricky situation for both of the dominant faiths within Metamor; the Ecclasia and the Lightbringers.
Pedomorphs are able to practice their faith, intimate, and familial situations, relatively without limitation. They are able to marry, though it is preferred that the marry others are likewise cursed with this aspect; but they are not barred from marrying those with other aspects of the curse.
Animorps face a good bit of complexity in their social situations, but species are not barred from mixing, to include humans, when it comes to intimate and family situations. This causes nothing more than the often complicated issue of bearing and rearing children; one never knows what might be born of such unions - human infant, or already manifest animorph infant. Where both parents are of the same, or very similar, species the children are almost always born as already manifest animorphs. Where the species differ they will typically be born human, and subject to the curse as they age, or more rarely an animorph of one parent's species or the other - or, even more rare, a hybrid of both. Human mothers always bear human children regardless of the gender of the father, while human males are in the dark as to the child they sire with an animorph.
Here the transgenders run into a formidable barrier. Due to the fact that the curse affects the body but not the mind, many transgenders still find themselves leaning toward the gender they preferred before the curse. If they preferred the same gender previously, this is no big issue, but if they were heterosexual before they are no longer such. This makes the established religions stumble and balk rather profoundly when it comes to dealing with these previously unexpected but now commonplace relationships. The Lightbringers are rather egalitarian, but such familial arrangements are not preferred but are accepted. The Ecclasia, to date, acknowledges such unions that were established before or beyond the bounds of the curse, but will not officiate over any matrimony subsequent between members of the same gender.
None are denied entry into either faith as long as they meet the requirements of that faith. The new Pontiff of the Ecclesia is even willing to accept child and non-human Clergy - but only for the Metamor diocese. The only requirement is that they are male when ordained (to date, no ordained priest or religious in the Ecclesia has received the transgender curse if they were ordained prior to being cursed).