Is there a fly? There should be a gargantuan fly. Compound eyes are freaky as heck!
Maybe something like this sketch I made?
How about skeletal monsters such as spiders, dragons like how about a skeletal version of each fully evolved monster where it could be more powerful in some ways but is weaker in others
Maybe like powerful magic abilities but weaker health, and armor?
Yeah something like that! Maybe each skeletal monster is different are each one is specialised in something else e.g one is good in armour and health but has weak attack abilities while a different one has beastly attack abilities but weak in health
what about a monster that looks similar to the loch ness monster nessie or the new jersey devil
what about an octopus type monster?
Like a Kraken like monster?
What about a dark Pegasus
That would be pretty cool!
Ooh ooh ooh we need a waffle eating cat! Yes that is my demand. Jk
Actual suggestion: I would love to see a Godzilla/ dark tyranitar type monster. Ooh and maybe a water/flying type fighting crane
( http://en.m.wikipedia.org/wiki/Red-crowned_crane ) or maybe even a Tsushima leopard type monster. You could also have a giant water salamander and a giant spider crab. You could probably manage a cooler version of this http://en.m.wikipedia.org/wiki/Elysia_chlorotica .
A leafy sea dragon monster would also be an awesome addition.
I forget what they are called its a glowing squid/octopus, that might also make a cool monster.
You could also do a stepped up Oriental hornet like creature that can generate electricity and attack using said electricity and deadly poison.
Sorry if I’ve made previously made or already implemented suggestions, also sorry for the ridiculously long post.
First stage monster that looks like a hedgehog
A sea dragon…not bad…
a leafy one at that have you seen those?
Oh yeah man, those things are awesome!
I know i want one in a tank in my house one day…
What about golems like a earth, ice, fire, dark magical one and a oceanic one!
I’m pretty sure they have monster like that on the fb page…
I’d still like to see something a bit more wyvern style like this! 
can you guys make it so you can fight with 4 monsters instead of 3 and make a 3 headed dragon please