Hi @Lilu,
Welcome to the forum!
Usually apps’ screens work a bit differently. You don’t need to create separate screen for each character; you can have only 2 screens for that.
Say, you have a list of characters (imagine it’s a spreadsheet): you have column “Name”, “Address”, “Fraction”, etc etc. These columns are DB Collection Properties. Let’s call this collection, for example, “Characters”.
Important thing here - when you “design” the collection, your data needs to have similarities; generally it’s not recommended to keep “spaceships” and “characters” records in the same collection.
Then you add characters to this list: Luke, Leah, Yoda, Darth Vader, … In other words, you create several records. Each record has its own values for properties:
Luke - Tatooine - Rebel
Darth Vader - Coruscant - Empire
etc etc.
With this, you fill in your Characters Collection with records.
Then, you start creating a screens to display this. The “All characters” screen may have a Simple List, displaying “All Characters”. You’ll have Luke, Leah, … in this list.
Then, you add an action to the list to link to the 2nd screen. Call it “Character Details”. When you click the link in the app, Adalo will transfer the data of current character to this second screen. And you can display the property values for this exact character in this screen. The thing is, that it is done automatically: if you click on Leah, then her data will be transferred; if on Luke, then his data will be transferred, etc. etc.
So on the 2nd screen you can add Labels, Images, etc. to display the details of current character. Use Magic Text to get the needed details.
Hope my explanation made things clearer 
Best regards, Victor.