What do you get for resetting a character's level?

In the most recent update to Fire Emblem Warriors (3/28/18), there was an option added to the temple at the camp: Level Reset. The description says "Get materials when resetting a character to level 1." There are certainly materials that I need and characters that I don't use as much as others, so I'm considering taking this action.

But what exactly do you get for doing this? It costs 1,000,000 gold, and raising that character back up wouldn't be a walk in the park so it's not an action I would take lightly. I don't need a bunch of gold materials or random materials that I might already have a lot of. I want to make sure that if I reset my character's level, it's going to be worth it.

While resetting your character to lv1 costs a lot of gold, you can actually see the materials you will obtain. By clicking on the character you wish reset, this opens a confirmation window listing the materials you will obtain after the level reset. Below is a sample from Update 1.5 overview video on YouTube

The level of the character prior to resetting is related to how many materials you obtain. For a LV96 Rowan in the video, you’d receive 9 Rowan’s Capes and 19 Rowan’s Bucklers. However, for a lv36 Rowan, I would have only received 3 Rowan’s Capes and 7 Rowan’s Bucklers

Based on the numbers of items received, this calculates to 10% of the characters level for the first item listed and the 20% of the characters level for the second item listed, both rounding down to the nearest whole number.