You can create as many AI characters as you'd like — there's no hard limit.
Your subscription includes one free character slot. Each additional character requires purchasing a new slot for 10 credits.
To create another character
Open the Characters tab.
Tap Create a character.
Confirm the 10-credit slot purchase.
Train your new character by uploading 3 photos.
For more details on how slots work, see How do additional character slots work?
Can I use two characters in the same image?
Not yet. Each generation runs on one character at a time, so two saved characters can't be placed into the same image. Multi-character media is coming soon.
In the meantime, if you want more than one person in a scene, describe the extra people in your prompt. They'll be generated from the description rather than from a saved character.