Who am I if I am controlled by someone?

Question

I am always on someone's cam,
He controlls the way I am.

I am tall,
And I listen to mall,

I am very fat,
Unlike a bat.

I can light a fuse,
Or abuse,
I can gather food,
Or chop down wood,
I can mine,
Or cut through slime,
I can build,
Or sell to a guild.

You can change my look for fame,
But my sizes will remain the same.

Who am I ?

Answer 1

You're

the PC from Minecraft -- I think his name is Steve

I am always on someone's cam,
He controlls the way I am.

Veedrac explained this -- on a computer screen, the player controls you

I am tall,
And I listen to mall,

You are taller than some of the other creatures (source: Minecraft Dimensions, http://ata4.info/mcdim/). "mall" is one of the music discs in Minecraft (source: Minecraft Wiki, http://minecraft.gamepedia.com/Minecraft_Wiki)

I am very fat,
Unlike a bat.

Again according to Minecraft Dimensions, bats are basically half a meter in all dimensions, but the PC is a meter wide

I can light a fuse,

In Minecraft TNT has a fuse

Or abuse,

This could mean semi-cheat stuff ("abuse" the mechanisms), using abusive language in chat, or just the fact that you're beating up/killing creatures

I can gather food,

Minecraft contains food

Or chop down wood,

Minecraft contains wood

I can mine,

Yep, you can

Or cut through slime,

Minecraft contains slime

I can build,

Yep, you can

Or sell to a guild.

I think only mods have guilds, but a lot of people play Minecraft with a mod, so.

You can change my look for fame,
But my sizes will remain the same.

Different player skins are available but they don't change the PC's abilities/size

Who am I ?

See the top of this answer

Answer 2

Here's a not-entirely-finished answer.

An RPG character that's a member of a race like the Pandaren (WoW) or Baraka (TERA)

I am always on someone's cam, He controlls the way I am.

"cam" meaning computer monitor. The player controls the character using this.

I am tall,
And I listen to mall,

I am very fat,
Unlike a bat.

These are tall and fat races. There's either a bat-like character or enemy that's thinner. For reference, Googling for bat with the RPG name gives a comparatively thin-looking giant bat for WoW.

"listen to mall" probably refers to some NPC or god named "Mall" or similar that the character follows. Nothing comes up in searches so far, though.

I can light a fuse,

Quest item

Or abuse,

PKing

I can gather food, Or chop down wood, I can mine,

Standard MMORPG actions

Or cut through slime,

Basic MMORPG encounter

I can build, Or sell to a guild.

More standard MMORPG actions

You can change my look for fame, But my sizes will remain the same.

Equipment gives bonuses, is vital to progressing in these games and is the main customization point of a character. However, the underlying character shape is pretty much invariant.

Disclaimer

I haven't played an MMORPG in ages, and I've never played the ones mentioned here.