So glad you asked! LOL My mom and I have been playing together a lot and we have actually had this conversation on several occasions.
I would like to add that it would be super if the next school pets had great talents like the level 58 pets, i.e. Spritely, blades, traps,etc. Cause it's no fun going through the quest to get a pet that you won't even equip cause you already have better.
Death- Dr. Von, Neza the Poet
Life- I like the Centaur idea; And possibly a pet with an AoE attack for all levels (Like the deer knight but for life)? Cause seriously, we're lacking in attacks to begin with.
Storm- The Shark Soldiers from Celestia would be awesome. Or the Eels they're cute too.
Ice- Ice Angel, or even the Blue and White Pegasus Mount as a pet, that would be awesome.
Good Morning to everyone! I would like to have morganthe's pet (the little spiders) so cute. And what about a mini car that when it cast a spell spills oil (from the front)or smoke (from the back) on them? But i think the one i would really like to see is a dangerous deadly plant pet that sprays deadly pollen :) And last but not least Annie pet (the green hag). Thanks