Does having a character with a “humanizing” persona/image or a “real life” person when promoting products on videos before leading to a sales funnel help to increase sales, or could I create a persona/image around my brand without having a character leading it and have the same conversion rates?

I've noticed that having someone that the audience can relate to tends to increase their ability to root for the person and feel emotionally attached. Can I do this with a brand only by promoting certain relatable values, or will the scope be limited? Would making a trailer and "about" section where I share my "vulnerable" side in relation to the product being sold have the same effect, or should this be included in every video or post I make?