Aliasing littlepip_(mlp) → littlepip
Link to alias

Reason:

We use the _(mlp) to refer to official characters for various reasons (and sometimes things that originate from ponies in general) so in order to least be somewhat consistent it should probably be aliased to this form

Or the other way around, it doesn't really matter.

Related implications:

• button's_mom -> fan_character done
• littlepip -> fan_character done
• fluffle_puff -> fan_character done
• princess_molestia -> fan_character (needs alias at bottom) done
• backy -> fan_character done

Just a suggestion since I can't see of a case where it wouldn't be mlp-related. This is basically the "unsure/controversial" part, so that's why I separated it.

• button's_mom -> my_little_pony done
• littlepip -> my_little_pony done
• flufflepuff -> my_little_pony Fixed and done
• backy -> my_little_pony done
• princess_molestia -> princess_celestia (needs alias at bottom) done

Related aliases:

• little_pip -> littlepip (optional but recommended) done
• flufflepuff -> fluffle_puff (optional but recommended) done
• fluffle_puff_(mlp) -> fluffle_puff (optional) done
• princess_molestia_(mlp) -> princess_molestia (currently aliased the other way around) done
• molestia -> princess_molestia (currently aliased to *_(mlp) one) done
• backy_(mlp) -> backy (optional) done

Edit: Additional suggestions (7 Jan)

Convenient tag reference for mlp fan characters (sorted by # of posts on derpibooru)

• fakémon -> fan_character (implication at least, alias probably needs discussion).
• mango_(character) -> fan_chracter
• aryanne_(character) -> fan_character
• Alias: honey_dip_(mlp) -> honey_dip
• honey_dip -> fan_character
• Alias: snowdrop_(mlp) -> snowdrop_(character) done
• snowdrop_(character) -> fan_character done
• nyx_(mlp) -> fan_character (I don't know enough about this character, but it seems to be used for some non-pony things too. An alternative might be nyx_(past_sins) or something similar.)
• pun_pony -> fan_character

• fleur_de_lis_(mlp) -> friendship_is_magic

Edit: Additional suggestion (8 Jan)

Any new ones will be put into a new thread, but the ones above are still pending so I thought I'd include this as well.

• surprise_(mlp) -> my_little_pony - She's not a fan character (although I've seen her mistaken as one), she's actually a g1/g3 character character that's frequently drawn in the "fim style". Either way she's definitely MLP.