Demonstrative pronouns are either strict anaphora, or can be cataphora being resolved within the same or next sentence or subsentence.
The use as exophora is possible and reduces the choice of intonation and stress patterns to exactly one, most commonly supported by appropriate gestures.
They all have in common that they link declension with an aspect of conjugation with their forms.
Colognian declension follows a case, gender, number scheme, whereas declension among others has a person and number scheme with three grammatical persons: the 1st person referring to the speaker or speakers as agents or patients of a sentence, the 2nd person addresses the listener or listeners of the speaker or speakers as agents or patients of a sentence, while the 3rd person refers to something or someone else but the speaker(s) or the listener(s) as the agents or patients of a sentence, and two grammatical numbers, singular and plural.
Declensed forms of personal pronouns combine these schemes.