I looked around a little and I couldn't see this suggestion so hopefully its not a repeat. I don't know what the use of the gatcha prizes are or where to see them but I think being able to make them your profile picture would be fun. I think it would be cool to look forward to getting a mystery prize and then being able to use it like that. It'd be like a real gatcha thing but instead of putting it on a shelf in my room I could have it as my profile picture.
Let me think on that! A lot of people actually already do that, but they take the time to download the image and reupload it as a profile pic. Having it a bit more streamlined would be helpful, I think.
As to where you see them, happy to help with that! When you get them, if you tap the "collect all xxx" link, you can see a full list.
And/or, on your dashboard, try tapping the settings icon in the top right. You can add/remove panels to your dashboard on that settings page, and one of them is your gacha collection :)
