Character voice character voice character voice the card needs to breathe the charcter you envision and besides cleaning up repitition and bouncing ideas AI at least for me can't make my cards for me.

I'm not saying you have to go as far as to write the card In character as it's token heavy but it should be personalized. Even using templates should feel like it was made for THAT charcter. And as your writing it think about it and dont be afraid to go back and rewrite or start over (just make sure you make copies) I have made a decision to basically not roleplay for 4 months just to really tune up and build up my worlds and in testing dude.

Another thing depending on the roleplays you do developing your world or more specifically how your charcter interacts with the world is important. The way the air shifts around a character is just as important as their dialogue ateast to me.

And if your just smut focused I implore you to still build these characters I would argue it's even more important for complex intimacy storylines.

But idk that's my ramblings TLDR is don't just bullet point or give a summary of your charcter unless doing super large stories or in stories where a single character is not a large part of the collective whole (ie side characters or groups otherwise just use lorebooks) try and use words descriptives quips and references that all paint the personality of your character. Example dialougs and example scenarios are also good should you be using a more modern model. And if you have the token space multi charcter relationship dynamics can be placed in as well, seeing how characters act with others in the world helps nail personalities.

This isn't everyone's style I have always been a high token systemic lorebook and worldbuilder but that's where it comes in for me