I'm not sure specifically as the name doesn't give much away. But usually, there would be a male and a female lead.
Since it's a 'Shop Love Story', there might be the shop owner as one of the main characters. And maybe a regular customer who gradually falls in love with the owner. Another possibility is two employees in the shop who develop feelings for each other.
In the Littlest Pet Shop Love Story, it's likely that the main characters are the various pets in the shop. There could be a perky parrot that brings a lot of energy and fun to the love - related situations. A shy turtle might also be a main character, whose journey in the love story could be about coming out of its shell and finding friendship or more. And of course, a furry little rabbit might be involved, perhaps falling in love with another pet or just spreading love around the pet shop with its friendly nature.
It could be a college student and a barista. The student is always studying at the coffee shop to get away from the noisy dorm. The barista notices how hard the student is working. One day, the barista offers the student a free muffin with his coffee. They start talking, and the student discovers that the barista is also interested in the same major as he is. They bond over their studies and fall in love.
The pets themselves could be the main characters. For instance, there could be a particularly charming parrot that loves to talk to customers, or a wise old tortoise that has been in the shop for a long time and has seen many things. There might also be a group of kittens that are always getting into mischief and are loved by everyone who comes to the shop.
There could be a whole host of characters. Besides the obvious pawnbroker and customers, there might be a sidekick of the pawnbroker, like an assistant who helps with the appraisals. There could also be a character who has a vendetta against the pawn shop, perhaps someone who feels they were cheated in a past transaction. Or a nosy neighbor who is always spying on the comings and goings at the pawn shop.
I don't know since I haven't read it. Maybe there's a weapon smith as one of the main characters.
The main characters include Seymour, a young and somewhat naive florist. He is the one who discovers and nurtures the mysterious plant. Audrey, a sweet girl who works with Seymour and is the object of his affection. And Audrey II, the plant which is not only a character but also the main antagonist in the story. It has a personality of its own and constantly demands to be fed, driving the whole story forward with its bloodthirsty nature.
There could be the pet shop owner as a main character. He or she is likely the one making decisions about the 'free' aspect in the pet shop.
In 'the old curiosity shop story', one of the main characters is surely the shopkeeper. They are the heart of the story, the one who knows all the secrets about the items in the store. There may also be a regular customer, perhaps an old collector who has a special relationship with the shopkeeper. Additionally, there could be a young protagonist, a wide - eyed newcomer to the shop who is full of questions and wonder. Their interactions with the other characters drive the story forward and help to unfold the mysteries and charm of the old curiosity shop.
Often, there is a shopkeeper who is a key character. He or she knows all about the magical items in the shop and guides the customers. There might also be a young and curious customer who enters the shop.
Since I don't know the story well, I can't say for sure. But it could be the shop owner as one of the main characters.