Ok then, I guess I could post them here.
Spoiler warning.
Now, the first thing I need to say is, DON'T SWEAT IT. There's a lot of stuff I'll need, and don't try to do it all at once.
This game's graphics will be somewhat anime-style, as in Final Fantasy VII or Adventure Quest. It would be preferred if you could draw them like this.
As for the eight main characters, wait until my cousin draws some concept sketches. Don't have any monsters yet either, but there are supplementary beasts and summons in the party.
The following are mostly up to your interpretation, I'll give descriptions for some things.
Tameable Beasts:
Wolf, Turtle, Hawk, Raccoon (all about average size)
Bear, Elk, Eagle, Boar (average size)
Gator, Crab, Gull, Serpent (average size)
Beefy Yosher, Blockhead Yosher, Speedy Yosher, Smart Yosher (think Yoshi, but smaller and different) (average size)
Rhino, Tortoise, Vampire Bat, Badger (slightly bigger)
Scorpion, Rock Lobster, Vulture, Rock Spider (slightly bigger)
Python, Stag, Falcon, Giant Owl (slightly bigger)
Lion, Giant Toad, Heron, Peacock (rather large)
Dark Tiger, Lava Tortoise (has rocks for a shell), Magma Hawk, Flame Ape (rather large)
Forax (a raptor), Cerox (looks like Triceratops), Saloux (looks like a hadrosaur), and Kyxor (some kind of dinosaur, above average intelligence). (rather large)
Tameable dragons: (all large)
Dragon
Blue Dragon (lives in water, breathes steam)
Red Dragon (better at fire-breathing)
Yellow Dragon (small, fast, thunder-based)
Green Dragon (lives in forest, breathes poison gas)
Brown Dragon (hard skin)
White Dragon (breathes cold breath)
Grey Dragon (smallest, fastest).
Also, the elemental summons:
For the first 7 groups, make the first one smallish, the second average-size, and the third, large.
Water: Sea Horse, Nymph, Mist Dragon (made out of mist)
Fire: Salamander, Chimera, Phoenix
Thunder: Lightning Wolf, Thunderbird, Volt Dragon (all made out of electricity)
Growth: Dire Wolf, Dryad, Treant (treeman)
Stone: Rock Rat, Rock Beast (looks like a rhino), Golem
Ice: Frostbiter (very small), Yeti, White Wolf
Wind: Harpy, Gryphon, Quetzl (giant feathered snake)
Light: Sunhound (average)
Darkness: Shadow Wolf (average), Basilisk (make the basilisk mid-size)
Demonic: Imp (small), Bloodfiend (basic warrior, medium-size), Flayer (lots of scythe-arms, medium-size), Souleater (more magical, medium-size), Ether Dragon (ghost-like, large), Bloodlord (wait for a picture for this one), Archdemon (large), Chaos Dragon (two-headed, large)
Undead: Zombie, Skeleton, Ghoul (all medium), Hakk (troll-like undead, rather large), Banshee (medium-size), Lich (large)
Advanced Undead: Arm Snake (made out of disembodied arm, small), Rib Spider (the ribs are for legs, and skull for body, small), Skull Trap (a skull encaged by ribs, small), Cerberus Hakk (3-headed, see above, rather large), Slayer Zombie (replace all arms with deadly weapons like maces and swords, a bit bigger than a zombie), Corpse Tank (actually a tank made out of corpses, large), Bone Dragon, Frost Wyrm (a cold bone dragon) (both large)
Alchemal: Homonculus (small-medium, either one)
Technomagical: Probe (hovering sphere), Excavator (small drill on wheels), Mini Tripod (3-legged) (all 3 are small), MagiMech, Sentinel (both medium), Panther (tank on legs, large)), Tripod (think War of the Worlds, large)), Iron Dragon (large)
That's about all for now.