Great post, by the way! Most of the time, I am a combination of the following:

The Scientist > I really love to experiment with game mechanics and game engines.

The OCD Gamer > I'm a natural explorer. I leave no rock unturned. But achievements are not my bag.

The Gamer > I play a great variety of game types. I believe in a balanced diet. ;)

* The Hedonist Gamer > Sometimes, I play games purely in pursuit of pleasure and strive to maximize my pleasure buzz. Nothing else matters when I'm in that state of mind! Not the score. Not the leveling up. Just the pleasure.

* The Machinimist Gamer > Sometimes, when I'm feeling creative, I play a game just for the sake of recording my gameplay and creating a movie with it.

Like the sort of person who would do this sort of thing?

https://www.rockpapershotgun.com/2018/10/22/grand-theft-auto-v-hackers-killed-people-in-singleplayer/

(That is, hack into someone else's single player game, ruining, for example a speedrun.)

-The Photographer
The Photographer lives to capture either beautiful or unique gaming moments in the games they play and has an extensive screenshot library. More dedicated Photographers replay particular sections or cutscenes from a game over and over looking for the perfect shot that captures the moment they are looking for.

OCD, Backlogger, Nerdy, Photographer

- Basement Dweller:
Only leaves the gaming rig to eat, sleep, or crap - basement not required.

> At some point, because of being free from everything. (young blood)

- The OCD Gamer:
MUST explore every possible corner of a map, collect everything, talk to every single person, and often must get all achievements.

> That straight-up hits the spot.

- The ADD Gamer:
When given an important quest, always gets distracted along the way by something else: "Ooooh a cave!!".

> A natural by-product of being "- The OCD Gamer:" I guess?

- The Farmer:
Sits in one spot in a game and kills zombies for 12 hours straight, or until zombies drop a shiny weapon or other shiny item.

> I can tolerate grind, so yeah.

- The Scientist:
Loves to experiment. Will often load a save, try to do something, and reload/quit afterwards just to see what will happen. Enjoys figuring out how the game works, and what the game mechanics are. Will sometimes play a game in unusual ways just to see how the game behaves, sometimes using cheats or intentional deaths.

> Mostly reloading for dialogue/choices as I don't want to miss out on the other parts.
> Never the cheats/console commands though.

- Hardcore Gamer:
Lives for games. Likes many types of games and spends way too much time playing games. Very competitive. Prefers difficult games. Also known to be very antisocial in some cases.

> -competitive
Not necessarily difficult games, but...
> Most often I choose the highest difficulty, but not because I am a Pro (I am not) rather because I want to experience what the game/devs have to throw at me at once, as I don't prefer replaying games. (I'd rather spend the time playing/doing something else OR sleep like your dedicated Sloth)
> If it's too hard for me, then that's when I drop the difficulty.
> "Also known to be very antisocial in some cases" Ouch!

- The Gamer:
Likes many types of games, spends a lot of time playing games, and often has a natural talent for certain genres.
Opposite to Casual Gamer.

> Not natural talent - Honed talent (gotta spend those points somewhere)

I'm gonna have to add another category.

I'm a tinkerer. I tweak just about every game I play.

Besides, that, mostly a nerdy / casual gamer.

Man with me quite few of those options describes me perfectly.

Such as Old Timer, -Casual Gamer 2, and the Backlogger to name a few.

Also the Scientist might fit me as well as I like to experiment with stuff within games. I feel that Trial and error also fit into this category because there are a lot of times where you will try something and then you will die. The same goes with cheat codes as well.

Yeah I know. I remember playing I think it was Bart Vs the World and I used the infinite lives cheat and I was collecting lives and I got beyond 9 and the game got confused and instead it being represented as 10 lives the game got confused and it said I had 0 and after I died and got the Game Over screen. Yeah cheats can back fire like in your Dragon Warrior IV example. Also Using cheats in game like Double Dragon III on NES for example can backfire by making the game more difficult instead of making it easier.

This reminds me of how, in the original Super Mario Bros. (as well as in the Japanese SMB2 on the FDS), if you got too many lives (around 128), the game, seeing your lives count as a signed 8-bit integer, would think that you have a negative number of lives and give you an instant game over.

It also reminds me of a funny exploit in Sonic the Hedgehog 1 and 2, where by losing two lives at once when you only have one (for example, enter water when the timer reads 9:29; you'll drown and time over at the same time), you could get the lives count to underflow; this results in the game saying "GAME OVER" but continuing anyway.

There's also the race condition in Sonic 1 where, by losing your last life after clearing a level, you can continue with 0 lives (including your current life) remaining; it's one of my favorite examples because the race is slow enough to be visible to the viewer.

I used to be hard core into the mmo scene. Nowadays I am casual but enjoy my games very much when I do play. Got a lot going on IRL these days.

- Old Timer:

- Nerdy Gamer:

- The Retro Gamer:

- The OCD Gamer:

- The Farmer:

- The Backlogger:

Casual 2 and OCD
I enjoy games for their story and exploration, I attempted another playthrough of Uncharted 2 but on hard... it didn't last long :P

Sorry just saw the list on page one.

-Old Timer
-Nerdy Gamer
-Casual 2
-Backlogger
-ADD Gamer
-Collector
And to a lesser degree:
-The Gamer

-"younger generation" of Old Timer (I've started playing since second half of 90' not 80', since I was borned in 89)
- backlogger (but fortunately, there are cases when bought game is so intense and great that I'm starting playing it immediately and not stop till very end, like I recently have with Project: Warlock)
- "sort of" Retro Gamer (but with my personal "borderline" set in VGA standard (and/or games on 16bit consoles)
- borderline between The Gamer and Hardcore Gamer

Plus my own typology:

- time traveller - hunting for old, lesser known (or never re-released) games in physical versions (especially keen on those rare occasions when finding some folied copy, for acceptable price)
- forum-man - love to discuss about almost any possible aspect of the game - why X faction is better in long-distance fight than Y, possible interpretation of the plot/ending, etc. Avoiding facebook, twitter etc, since they're no use for discussion.

Nerdy fossil right here.

Guess that makes me a trilobite. (The nerdiest fossil that ever was. Fight me.)