For the actual keys themselves, I have my car key/alarm, a front and back key for my apartment, a Star Wars key for my mom's house, and a key for a house where I watched someone's pets, but that was years ago, lol. For actual trinkets, I have a Lego R2D2, a blue band thing, an OHS Class of 2010 thing that needs to come off because that's old as shit, and a Boo. I think I've got my YMCA card on there too, despite never...going...there...yeah...lol
My first set of keys I wouldn't call a set cause it was just the key itself, but I think I was 14 when I got my own key to carry around with me. I kept it on a necklace...worked out well cause I was obsessed with keys in my teen years, so I never really forgot it since I thought I was ~making a statement~ or whatever.