I was so happy about the Trigun re-screeningMost likely the Badlands Rumble movie? that I dug back out the TV version's DVD out of nostalgia... I found lots of important information on there, so feel free to use this as a reference!
However, I think this is just information for the anime version at the time. (like Wolfwood's age)
[2017/06/27] Back then, his physical enhancements didn't exist yet....
I think the anime adaption was around the time of Trigun (original) – Maximum Vol.1?
[2017/06/27] I have a feeling it's supposed to be 6-feel instead of 5...?
[2023/05/11] The height measurements are wrong! Be careful! (Even though it's official material...lol)
[2023/07/16] It's kinda funny that such important info like height is wrong...
Their heights are on the Puff interview too, and there's someone out there who posted photos so I suggest you look for it!
Disclaimer
UPDATE: At the time of my initial Tumblr post, I could not see most of the replies to the Tweet because of Twitter's layout and the fact that OP's account was private for a while (I only had a screenshot of the main Tweet). I have now seen and translated all of OP's follow-ups to the Tweet.
It's still true that the heights are wrong, but it is up to you to decide how to interpret the "wrongness" of it.
THESE CHARACTER MEASUREMENTS ARE NOT CANON!! It's not showing "how short the characters in Trigun are," it's more like a representation of Nightow's style of making stuff up as he goes.
Prior to this Tumblr post I had mentioned a few times that I remembered seeing "real" conversions for the weird units in Trigun. I ended up finding the Tweet that I got the info from, and the details of it.
There are also some other nice info about money and Nightow’s character- and worldbuilding—or lack of thought about it lol.
These lengths (provided in metric) are almost exactly the same as their real-life imperial counterparts.
The character heights are also completely wrong. Using these units, Vash's height converts to 158cm, when we know that he's canonically 180cm in the '98 anime.
Money
1 $$ (double dollarダブドル (dabudoru)) ≈ 100 ¢¢ (cescentセスセント (sesusento))
$$ are worth a bit less than USD.
Character ages
Vash: about 150 years old
Wolfwood: 26 – 28 years old
Meryl: 23 years old
Milly: 21 years old
Character heights
Vash: 5 feel 2 iich158cm (!??!??!?!)
Wolfwood: 5 feel 3 iich160cm (same as my mom lol)
Meryl: 4 feel 5 iich134.7cm (girl youre shorter than the shortest person i know. and shes pretty damn short)
Milly: 5 feel 2 iich 158cm
Character name origins
"Hmm... To be honest, I didn't put much thought into them. It's not like I didn't think over them at all, but I focus on what sounds cool when pronounced, rather than the meaning of the name. I mean, if you turn 'Vash Stampede' into Japanese, it becomes 牛の暴走 (a wild rush of cows)! (lol) That doesn't match his character, does it? Well, maybe it does...?" -Nightow
Population density
Very low, since the ships made emergency landings across a large area of the planet.
■ How old are Vash and co.?
Vash is approximately 150 years old, Wolfwood is 26 – 28 years old, Meryl is 23 years old, and Milly is 21 years old. -Nightow
■ Vash and co.'s heights
(Determine figurine scales with this!)
Vash is about 5 feel 2 iich, Wolfwood is about 5 feel 3 iich, Meryl is the shortest in the main cast at 4 feel 5 iich, Milly is the same as Vash at 5 feel 2 iich, I suppose? -Nightow
* For their heights in centimeters, refer to the unit conversions in the back of the D-2 sleeve.
■ What do the characters' names come from?
Hmm... To be honest, I didn't put much thought into them. It's not like I didn't think over them at all, but I focus on what sounds cool when pronounced, rather than the meaning of the name. I mean, if you turn "Vash Stampede" into Japanese, it becomes 牛の暴走 (a wild rush of cows)! (lol) That doesn't match his character, does it? Well, maybe it does...? -Nightow
■ Worth of money
● $$ (Double dollar) ● ¢¢ (Cescent) - One cescent is 1/100th of one double dollar.
By the way, the double dollar is worth a bit less compared to the real US dollar.
■重さの単位
あ、特に考えてませんでした(笑)【内藤】
■ Units of weight
Oh, I didn't really think of any. (lol) -Nightow
■ How much is the population density in the Trigun universe?
Because the ships made emergency landings across a large area of the planet, the population density is very low. -Nightow
■ How long is a day in the Trigun universe?
One day in the Trigun universe is about 24 hours, the same as an Earth day. -Nightow
2024/02/28 Added tweet dates and pronunciation guides
2023/12/08 Added full translation, replies, and disclaimer update
2023/12/07 Fixed typos and transferred to Neocities
2023/06/30 Posted to Tumblr