[NameOfGame] will be a [2D or 3D or ?D] [optionally name the art style, e.g. anime] [singleplayer or multiplayer] [VPS/RPG/SIM/etc.] game where the player has [a small number or a large number] of [type of pet if you know it already] which which they do [combat or other main activity of the game].
WildWright will be an MMORPSIM game where you fight to build up a collection of pets which become both your army and your workforce, and you can even use one as a mount. Sim elements of the game include your estate, where you tend your pets to produce crafting resources, and which you upgrade to increase your crafting and pet breeding abilities. RPG elements of this game include combat [tactical or real-time?], interactively building your reputation with NPC factions, and building friendly or romantic relationships with specific NPCs. WildWright will take place in a 3D world, beautifully illustrated with 2D anime/fantasy-style sprites. [Full 3D would also be acceptable if creatures can be modeled to look like they have lots of personality.]
More templates and fill-in-the-blanks from my guide:
The player will control/be [number and type of playable character(s)] who will be [profession] who [game's main activity such as fighting, questing, solving puzzles, or crafting] in the [description of game world] world of [world's name]. [Other important activities] will also allow the player to satisfy their urges to [explore/become wealthy and famous/play mad scientist/help someone/be clever/build something/investigate a mystery/save the world/etc.].
Other templates used from part 1. of the guide (only the ones I actually used are copied&pasted here):
2. A game where you fight to build up a collection of pets which become your army or workforce (units in your combat squad, cards in a deck, or part of your home base producing stuff for you).
4. A game where you have a farm or ranch where you raise many pets to sell, compete with, or build up to a complete collection.
5. An interactive story game where you talk to [s]creature[/s]-characters, trying to befriend them or solve problems related to them.
You will create a humanoid avatar who will begin as a member of the WildWright race, just about to reach adulthood. WildWrights are a race of life spirits or fertility nymphs [Call them what exactly?] who have an affinity with life in all its forms, and can develop the ability to command monsters in battle, magically engineer new organisms, and change their own bodies to have more anthropomorphic appearances if they desire. The setting of WildWright is a fantasy universe composed of flat-earth islands floating in a "space" filled with breathable air, which can be crossed on the back of a flying mount or by a magic-powered flying ship. [Possible names for this universe: shardlands, fragments, isles, shattered lands, scattered lands, splintered lands, the wilds, etc.] WildWright will be a ton of fun and highly immersive because it will give you the opportunity to: explore a unique fantasy universe, play mad scientist, help NPCs with their problems and investigate mysteries(questing), fix up dilapidated areas, be a clever combat strategist quick-witted minigame player and mount-racer, collect an assortment of items including pet monsters, clothing, plushies, and NPCs (by building up a relationship with them until they want to come live with you), build and craft creatively and display your creations and collections to other players, play the game's market, and become rich and famous among the game's NPC population (ultimately, players can become god-like).