About deleting unnecessary character, I figured out that you need to press A on the text window and use the D Pad to scroll, which is inconvenient, since everyone is using stickers to control movement, you forget about D Pad. In any case, it says here that to delete an unnecessary character you should press CTRL + Yes, since most players use a gamepad on the console, the CTRL button is simply not on it. And yes, to remove a character you need to hold LB + RB, which is not written about in this window.
Now about weapons and units. There is a window with the stat hp, pp and etc. Here, you simply can’t hover over it, since there is no cursor on the gamepad. I could not scroll this text in any way. LB & RB just switch the main windows.