I don't know what to post, so I'll do this

For the subtitle, you can use special symbols to grab the user's attention, some of these symbols are: ★, 『』, ♥︎, ★, ✦, ┆, ︴. For the character's definition, you can put all the character's details such as personality, appearance, fun facts... You can make the greeting as long as you can think of, letting the user participate in the bot's activity.

One thing I do is that I never put anything in the description, but I put everything in the definition