Our server has quite a few different "types" of pets; the standard pets (like poporing), fully custom pets (like Kasa) and then modified pets (like Succubus)
Since the update the standard version of the modified pet's eggs are now on our server too. (no pet that was gotten before the update was changed so they are still the modified versions) So Sen simply got the standard Dullahan egg instead of the modified HeRo halloween Dullahan. (so your Dullahan will eat 2x slower than the custom ones, eat the standard Dullahan food, and when it reaches loyal it will give you its stat boost, which i think is CRIT +5)
You still get the modified pets if you use the custom tames to catch them, ex. if you use a black lipstick to tame a succubus you will get the HeRO modified succubus who eats immortal hearts, eats twice as fast as normal, and has no stat boost. But if you got the egg without using the custom tame (I gather) you would get the standard Succubus egg that eats Flower of Life. (I unfortunately can't test this myself atm since I just transed my sage XD;;; )
Once I've had a chance to test everything I plan on updating the wiki with all the up-to-date custom pet info. (as its missing a lot of custom pet info in general right now)
On a comment about my quest idea, I found all the images for all the pet foods so if the GMs are missing any and so that's causing issues, I could post or send them to them. I really do hope this can be implemented in some way, and so anything i can do to help get to these foods being implemented I'm willing to do!
(though my weak point would be my poor programming skills...)
The Pet Maniac!
If you have any questions about pets, or there's a pet you'd like feel free to ask me!
IGN: Kiki Raemtal, Tessara, Terrimi, Kali KiRin, Elendramear, and Kaira Niami. Also leader of the Gotta Catch 'em All! Guild.