Written up quickly because Esmelthien was curious. Here's a short, incomplete look at my ideas for the Changeling language. Obvious not very developed, mostly because it will not be featured prominently, rather than used for "flavor." Some of the things I don't expect you to be able to understand without some knowledge of linguistics (or Wikipedia), as this is mostly for curiosity's sake, so not not much detail has been gone into, just bare facts to give a good big picture. With that...:

Consonants
---------------
"p" Bilabial tenuis stop
"t" Alveolar tenuis stop
"k" Velar~Palatial tenuis stop
"q" Pharyngeal stop

"b" Bilabial modal stop
"d" Alveolar modal stop
"g" Velar~Palatial modal stop

"c" Alveolar~Postalveolar tenuis affricate
"j" Alveolar~Postalveolar modal affricate

"f" Labiodental tenuis fricative
"s" Alveolar tenuis fricative
"sh" Postalveolar tenuis fricative
"x" Velar~Palatial tenuis fricative
"h" Pharyngeal~Glottal fricative~approximate

"v" Labiodental modal fricative
"z" Alveolar modal fricative
"zh" Postalveolar modal fricative

"m" Labial nasal
"n" Alveolar nasal

"r" Alveolar approximate~flap
"l" Alveolar lateral approximate~flap

"y" Palatial approximate
"w" Bilabial approximate

Vowels
----------
"a" short open~open-mid back~front unrounded/schwa
"aa" long open~open-mid back~front unrounded
"i" short close~near-close front~near-front unrounded
"ii" long close~near-close front~near-front unrounded
"u" short close~near-close back~near-back rounded
"uu" long close~near-close back~near-back rounded

(Some) Grammar
----------------------
Hasharbanu is a topic-prominent language--the "topic" is marked differently from the "subject." The topic always occurs at the beginning of a sentence, and the verb always appears last; roughly, the default sentence order is SOV. A sentence must always contain either a topic or an active verb; a topic, such as the pronoun xa "it" (topic), can be dropped if there is an active verb, and the verb, particularly avi "is/are" (often shortened in writing to just "v"), can be dropped if there is a topic, but one or the other must remain.

Adjectives, adverbs, and other modifiers almost always precede what they modify; the only exception is adverbs modifying other adverbs, in which case the order is free as long as it is obvious what modifies what; e.g. (in English) "somewhat slowly" and "*slowly somewhat" would both be acceptable in Hasharbanu.

Declination and conjugation are achieved (mostly) by transfix nonconcatenative morphology, AKA "semitic morphology." All nouns (except proper nouns and pronouns), verbs, adjectives, and adverbs are produced from trilitaeral roots: a sequence of three consonants that form a "base" from which many meanings can be derived, as specified by vowels. For example, the root n-y-z can form (xa) nayaza "of the spear/(impaling)" (topic/(gerund)), anyazi "impale/be thorough about" (verb), nuyiz "impaled/thorough" (adjective), and unayaazu "completely/thoroughly" (adverb). As can be seen from these examples, the meanings that can be derived from one root do not have to be connected "obviously" and can have multiple meanings determined by context. Of course, these are far from all the meanings that can be derived from n-y-z.

Forms that are not (exclusively) created by transfix nonconcatenative morphology include only prefixes attached to an already transfixed form. For example, the nu- of nunayiz "of the spear" (genitive) can form nunayaza "of impaling/of war" (topic). Historically, these meanings were represented by xa __(obj)__ anyazi; this development of nu- (and some other prefixes) greatly decreased the use of xa to the point it is now almost exclusively used in passive sentences, which are used primarily for indefinite subjects (as in xa unayaz iparuji roughly "it that flies is a spear") since topics cannot be indefinite, but even here the active form (such as xa paraja unayaz "flying (is) a spear") is more common.

(Historically, these prefixes were prepositions further specifying declined nouns that became attached to the transfixes they modified. However, because most of them modified more than one form, they remained "free" instead of becoming completely integrated, and ultimately "spread" to modify more than what they once did.)

The exception to the above triliteral forms and transfix nonconcatenative morphology are proper nouns and pronouns. Where proper nouns are used, they must be used in accompaniment with a pronoun (except when the topic or the object of the verb). In such cases, they are treated as an adjective; a "modifier" to the pronoun that "executes" their meaning in the sentence. A cultural note here: because Changelings are constantly in contact with other cultures, especially of note here being their languages, Changelings often borrow their words to use as proper nouns, particularly names for themselves.

Derivation is most often done by compounding, and the result usually has more than three consonants, so is not declined. For example, Hasharbanu is a compound of Hashara "of Changelings" and zabana "of language/speaking." Occasionally, if a word becomes a common part of many derivations (particularly the second part), it becomes a new affix (more numerous are postfixes). For example, -banu has become a way to derive "language of" even of more "ethereal" concepts, such as Kamakbanu "the language of charity" or, less literally, "the rules of generosity."

A Little Vocab. (in "dictionary form"/topic declination)
---------------------
qasaba: pony
kasaka: unicorn
sabala: pegasus
damana: Earth pony
tagara: transformation
jadava: magic
tagardavu: transformation magic/Changeling transformation
Maraza: Queen
gimaraza: mother
gitagara: disguise
gijadava: magic spell
giqasaba: alicorn (species)
darasa: correct
qasabrasu: the correct way of being a pony
jadavrasu: shadow magic (from a Changeling point of view, "deception" spells are most helpful)
tagarasu: complete transformation/perfect mimicry of species transformed into
gijadavrasu: shadow magic spell
gitagarasu: perfect execution of a specific disguise/transformation to replace another
tagardavrasu: the correct way/"art" of using Changeling transformation magic
gitagardavrasu: the choosing of a target to replace
Gimarazrasu Maraza: address and title for one's Queen and mother; e.g. Gimarazrasu Maraza Krisalis

And that's all--everything I could get out within a few hours, since I didn't want to spend too much time on this. (I hope this is what you were hoping for, Esmelthien!)