Hello! Sorry for that ask, but, I'm a little curious of what you would write in response... can be a little phrase~ So, how can I do a secondary character more interesting, even if appears a little?
Is your question how to make a minor character interesting?
THEN I HAVE AN ANSWER MAYBE:
Minor characters are just as important as main; if they’re forgettable, a whole part of your game/story world will also be forgettable. Do they need to be fleshed out and have names? Not always, but they do need to be memorable. Either with unique designs, or interesting dialogue, or their actions too, they need to stand out just enough to make the story have more flavor.
In Huntress, the amount of characters is small, so I could afford to make all of them have a unique identity at least. Ms. Dogwood is an outdoorsy, head-in-the-clouds type who has a pet dog and sympathizes with animals, and her face is rounder and has a softer expression, and her hair is messy which means she doesn’t care as much about personal appearance, fitting her character. She doesn’t say much, but she makes the character interactions more dynamic. Even Madder (in the house below) who hardly ever shows up, has funny dialogue that reveals that he’s a hermit, he gets teased by Lenora a lot, and while he has a sense of responsibility, he still lets Lenora do a job he thinks he should have done, probably just because he’s a young man.
In games with larger casts that need background filler characters who can’t have names and faces, either they are true fillers and have no interactions worth nothing (like large crowds) or, if anything, the story can mention them as world-building. Here’s an example of that in the TLG remake: