Welcome to the home of your character platform. Hero Charager Gateway provides a unified API and the database of characters, agents, and prompts so you can build your own character platform without initializing your own database.

Character Database Access

Access a growing library of pre-configured AI characters without managing your own database.

Model Flexibility

Use any OpenRouter-compatible model with your chosen character by specifying c:character_slug>m:openrouter_model_slug.

Stack like a lego

Combine character, your custom instructions and model to create engaging conversations.

OpenAI SDK Compatible

Integrate with your existing code using the familiar OpenAI SDK structure.

​
Using the OpenAI SDK

from openai import OpenAI

client = OpenAI(
  base_url="https://api.charactergateway.com/v1",
  api_key="<CHARACTERGATEWAY_API_KEY>",
)

completion = client.chat.completions.create(
  model="c:renji-asakura>m:google/gemini-2.0-flash-001",
  messages=[
    {
      "role": "user",
      "content": "Who are you?"
    }
  ]
)

print(completion.choices[0].message.content)

​
Using the Character Gateway API directly

import requests
import json

response = requests.post(
  url="https://api.charactergateway.com/v1/chat/completions",
  headers={
    "Authorization": "Bearer <CHARACTERGATEWAY_API_KEY>",
    "Content-Type": "application/json",
  },
  data=json.dumps({
    "model": "c:alice>m:openai/gpt-4o",
    "messages": [
      {
        "role": "user",
        "content": "What are you doing?"
      }
    ]
  })
)

​
Append System Prompt

You can append custom instructions to a character’s system prompt: 
completion = client.chat.completions.create(
  model="c:specter>m:openai/gpt-4o",
  messages=[
    {
      "role": "system",
      "content": "Respond in english regardless of the language of the user's message."
    },
    {
      "role": "user",
      "content": "What do you think about science?"
    }
  ]
)
Your system message will be appended to the character’s existing personality and behavior guidelines.