Before anyone complains, I do know that it would be a lot of work for the artists, and this idea doesn't have to be implemented all at once. It's just something interesting and might give the artists something to do during downtimes.-----
I've had the idea of Creatu variants, or a subspecies of a specific creatu. It can be counted as a 2nd creatu type [alongside Mutants]. Effects don't count towards this as they're not a permanent ideal. Variants would give the idea that the creatu are 'evolving' in their own way.
For example, an otachie egg could have a small chance of hatching an otachie with a growing lion mane. [Full mane when adult]
I've thought of some other ideas for the common pets. [Seasonals and CS pets will not be included]
Relcore
Berrok - Vines or crystals on their backs
Chimby - Porcupine quills on their back
Gondra - Feathered tail
Leverene - Fluffy tail
Malal - Rhino horns
Paor - Claws on feet
Vogar - Spikes on back
Zenirix - Ridgeback
Scria
Drindian - Tail fins
Intes - Antlers
Kayoki - Floppy ears
Meragon - Feathered wings
Mirabilis - Remove the 2 'long' tail feathers and made the red butt feathers longer.
Valabex - Change horns to Antlers
Zaphao - Remove back spikes and add electricity spiral on tail.
Reiflem
Ardur - Add larger spikes on tail.
Aukira - Feathered 'eyebrows' or ear tufts
Meiko - Horns, flaming tail tip and flaming mane
Myotis - Ear tufts
Otachie - Lion mane
Roditore - Curly ear tips
Veram - Feathered wings
Atquati
Ahea - Leafy tail fin
Draqua - Teal ridge from nose to forehead
Goiba - Spikes on the shell
Murren - Replace white crests on shell with crystals
Quelis - Replace stone spiral on shell with kelp or seaweed.
Sirleon - Short mane, split tail fins
Skaldyr - Front pinchers
Tesuri - No wings/webbed feet, Fangs
The hatch percents for a Variant would be between 1-5%.
Variants would also be used in Kir quests and for Creatu Collections.