Quick, simple table for keycap info. Feel free to help improve this template.

Parameters

Type: The manufacturing process and material. (E.g. ABS, Doubleshot ABS, PBT, Doubleshot PBT)
Legends: How and whether the text is printed onto the keycaps. For the same of searchability, use the terms Top-printed, Side-printed and Blank. Feel free to add an elaboration afterwards if there is a need to do so.
Profile: Cherry/OEM/DSA/whatever; leave blank if you don't know.
Stem: If it fits Cherry/Gateron/Outemu/Kailh/Greetech/whatever clone switches, then it's going to be MX. Otherwise, set this value yourself.
Thickness: If you have them in person, self measurement is welcome. Otherwise, use the value advertised. Failing that, just leave it blank.
Backlight: Whether the legends are designed with backlighting in mind.
Bleed: Whether they keycaps bleed light.
Production: Whether they are still in production.

Example

{{Keycaps
|type=PBT
|legends=Top-printed, Side-printed, Blank
|profile=OEM
|stem=MX
|thickness=Unknown
|backlight=No
|bleed=No
|production=Yes
}}

Type	PBT
Legends	Top-printed, Side-printed, Blank
Profile	OEM
Stem type	MX
Thickness	Unknown
Legend backlight support	No
Backlight bleed	No
In production	Yes

{{Keycaps|stem=Topre}}