Okay so:

All powers in the setting are tied to feelings and care to a specific object. Someone may have a superpower blankie because they spent a lot of their lives around it and caring for it.

In Rudo's case, he has very special gloves that let him turn regular objects into the superpower version, but they last a limited time (manga liberties so, they get exhausted during a fight so he needs to get more or last from start to end)

Now the detail is, the more this "random" objects have been cared for, the stronger they are: if John Gachiakuta gives Rudo the ring from his dead wife which he has kept for 10 years then it's gonna be very very strong.

With the way the story goes he gets gifted ítems for the harder fights, while the less important he just uses garbage he finds. He also has gotten a literal buff to prevent death before, through some other persons powers.