I’m gonna release a tool that I forgot to release.
Don’t like manually defining arbitrary custom IDs? Just want your definitions to be sequential and unique? No? Yes? Don’t care? Then put your hands together for 
Enumerate
This is a small tool that takes lists of strings that you want to be defined and gives them all unique, sequential IDs. I find this especially useful for defining a lot of custom items, classes, characters, animations, etc where I really don’t care what the ID is, but I do care that the ID isn’t shared with some other item, class, character, animation, etc.
This tool should be easy to use I hope
This was written in Python, and as always get it from the link in the OP.
For an example on how I abuse extensively use this script, feel free to check out my working project github: https://github.com/Snakey11/Legends-of-Avenir/tree/master/Definitions
This was designed to play nicely with TableManager, my CSV assembler, which doesn’t care what IDs actually are. What I find quite nice to do (I’m totally not biased I didn’t create this system or anything) is let Enumerate hand out arbitrary IDs to all my shit, have TableManager work exclusively with definitions, then use definitions elsewhere. I think this is a much cleaner method than manually defining IDs personally.
The command line arguments for this are:
enumerate (inputfile) (outputfile) (optional -c flag to delete output flag on error)
The input file I’ll get to in a sec. The output file will contain a huge list of #define YourDefinition 0xDefinitionIDs that you can simply include.
Now the input file is a file where you list things you want to be definitions.
I'll just give a straightforward example as to how it should look.
Jasper 0x01
Derek
Val
Helmer
Baret
Walter
Vicar
This inputted will output
#define Jasper 0x01
#define Derek 0x02
#define Val 0x03
#define Helmer 0x04
#define Baret 0x05
#define Walter 0x06
#define Vicar 0x07
That’s the basic idea.
You can restart numbering like
Jasper 0x01
Derek
Val
Helmer 0x10
Baret
Walter
Vicar
and this will produce
#define Jasper 0x01
#define Derek 0x02
#define Val 0x03
#define Helmer 0x10
#define Baret 0x11
#define Walter 0x12
#define Vicar 0x13
There are a couple other directives I’ve got for ya. You can .include files to start a new numbering system. If you .avoid value1 value2, numbering will… well avoid assigning definitions between those values inclusive.
An example with avoid:
.avoid 0x03 0x05
Jasper 0x01
Derek
Val
Helmer
This will produce
#define Jasper 0x01
#define Derek 0x02
#define Val 0x06
#define Helmer 0x07
You can line comment with @ or // just the same. If you have overlapping IDs within the same file, the program will throw an error. Whitespace lines are ignored.
I think that’s about it. It’s a small script, and I’m open to suggestions for improvements and additions.
Hope this makes someone’s life easier. Enjoy! 
Fast edit: I’ve also just reorganized my opening post now that there are more links accumulating there.