Irving is a Fairy available in the Additional Fairy Pack of the game.
Normally, at max level, he looks like this:
He has the following abilities:

• Ice Support +3
  
• Bow Prowess
  
• Ice Support +4
  
• Ice Support +5
  
• Post Battle HP +4

There is not much to talk about, except that is "Ice". Every fairy in the DLC represents an element. However, Irving's art largely suggests that he is Water-type while his stats are Ice-type. Not only that, Nivea also has Ice-type and there is no Water-type Fairy.
Here is Nivea.

So what does this mean? In an idea world, Irving is supposed to be Water-type. So, although this world is not idea, I want to make it better.

As I said above, this guide is extremely easy.

• Step 1: Make sure you have bought the DLC
  
• Step 2: Download this database file for Irving. [https://1drv.ms/u/s!As0mVXE_oAginXaAOxD6MdbR7HSW] Here

[/url] (It's like 6.5 KB)

Step 3: Go to this location
[Your Steam Library Folder]\steamapps\common\Fairy Fencer F\DLC03\DLC
and replace the database_en008.cl3 there with the one you just downloaded.

Step 4: Run the game.

[/list]
There you go
Enjoy the new Irving.

Well basically I use a Hex Editor[mh-nexus.de] to modify 3 values from the data file.
How did I know which value to modify in the first place? Well, I didn't.
It took me 3 hours to find the right value location and figure out the necessary value. It's painfull, sure, but I got it finally.
Enjoy the DLC.