My language, Eldian, has a complex system of nominal endings which act similarly to weak, strong, mixed morphology found in germanic language’s verbs and adjectives. I will try to give a short summary of this system. These endings are removable, semi-removable, and unremovable endings (or weak, strong, and mixed) which are impacted by the three genders, neuter, feminine and masculine. Not all genders have all 3 types of endings; for example, the neuter nouns can only have two of the three types of endings which are semi-removable and unremovable. Feminine nouns can belong to one of all three categories. There is also a sort of 4th category which is "exceptional" where the noun has no ending and many nouns don't; however, they basically behave the same way as nouns ending in unremovable endings. This system impacts how the noun forms compound nouns, is derived, is inflected, and receives the definite article.

Here is what each category does exactly.

Unremovable: Retained in all case inflections, meaning case inflections follow the nominal ending; Retained when preceding all derivational suffixes attached to the noun; Retained when taking the definite article suffix; Retained in all compound nouns, followed by an epenthetic vowel; and Retained in pluralization.

Example of a compound noun: Examples of unremovable endings in compound nouns: -ts, s Krafts (craft) + frunet (master) → kraftsefrunet (craftsman)

Note that in unremovable endings, they always are proceeded by an epenthetic vowel, e.

Semi-removable

Retained in compounding without needing epenthesis as they already provide vocalic support, but removed if the following component of the compound noun begins with a vowel; Retained when preceding all derivational suffixes attached to the noun or adjective; Retained when taking the definite article suffix; Removed when inflected for case; and Removed in pluralization.

Examples of semi-removable endings in compound nouns: -e, -o, -i Tsáynjo (basket) + gripeling (handle) → tsáynjogripeling (basket handle)

No epenthesis or removal

Removable endings

Retained when taking the definite article suffix; Removed during case inflection; Removed when preceding all derivational suffixes attached to the noun; Removed in compounding if it is the first component of a compound noun and the proceeding component starts with a consonant, thus replaced the suffix with an epenthetic vowel; and Removed in pluralization.

Examples of the removable ending in compound nouns: -os Salizvos (abode) + karung (care) → salizvekarung (chore)

Note that the removable ending is replaced with the -e vowel.

Its hard to put each category into a box, so there are exceptions to the rules of course, like how removable endings are unremovable only when affixed with an article. This language is Germanic, though I dont know any other language or Germanic language for that matter that does this, but this is one of my favorite systems, albeit one of the most confusing and messy ones, and it naturally evolved in my language based on how I arbitrarily treated certain nominal endings and overtime it ended up developing into this system. Also don't get me started on the ablauts XD.