Use the information you already have to fill in the bio. Here's an example with an on-the-spot cat I made:
Name: Snowripple
Gender: she-cat
Clan (If Loner, rogue, etc. put N/A: RiverClan
Rank (Kit, Warrior, Deputy, etc): warrior
Age: 15 moons
Appearance: white tabby she-cat with green eyes
Personality: brave, fierce, stubborn, provocative
Likes: fighting, hunting, shouting
Dislikes: kits, mercy, ShadowClan
Weakness: doesn't think things through
Any life-altering defect (crippled, blind, deaf, etc.): N/A
Extra (Items, accessories, etc) :N/A
History: Can't be bothered. Do them in your forms but as this is an example, I don't want to go into things too much.
Father: Jaystream
Mother: Wavegleam
Brothers: none
Sisters: Whitekit
Mate(s): N/A
Apprentice(s): Sootpaw
Mentor(s): Emberglaze
Crush(s): N/A

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How to make a warrior cat OC(improved version)
FanfictionNote: This was written a long time ago, please see the Note chapter for more details -March 2023 This is a fool proof method for making an OC you will never forget! Enjoy making a personal cat with a detailed history and amazing personality traits t...