This is a cardboard standee. They're usually shaped cut outs at life size or about life size of characters. These are usually set up as store displays or promotions at events. Fans sometimes manage to be able to collect them when they're moved off after the promotional period ends.
In this case, it's Love Live! Rin, on her Sonic cross promotion. The standee was made from a giant version of the promo art, where she's holding a cute Sonic doll. It appears all of the other promo crossover items have this same art/same theme, including the statue.