It might best that these mobs are given some more interactivity in the world. Note, however, that certain Goals may be taxing on TPS, or simply not possible in code. Whatever it may be, these are proposals:

Growth Sappers

Make them breedable. Feeding them Geode Juices (except Elixir) may change their colour.

Howlite Wolves

Stays in packs and follow each other. Will start following Blue Howlite Wolves if any of them are near.

Spellbound Elemental

Make them temporarily hostile if struck. Shoots projectiles if angered.

Nomadic Lagrahk

Make them temporarily hostile if struck. Throws targets, does not deal damage. Other nearby Lagrahk, if not a variant, will flee the area.

Rocky Luggeroth

Panic if struck. Either scramble or hide into shell.

Saltion

Make temporarily aggressive if struck. When it bites, inflict negative status effect.

Mineral Arenthis

If struck, inflict negative status effect using the Squid's behaviour.

Primal Beast

May shoot fireballs.

Shalurkers

Won't attack unless looked at. Follows players.