Aliasing oaks16 → oak
Link to alias

Reason:

Additionally:
orchish_(pixiv) A-> oak

Same artist.

-1. Oak is used as a term for a lot of other things, including a type of tree and several other names. I'd suggest aliasing to either orchish or oaks16 instead

-1 oak shouldn't be an artist tag, seeing how ambiguous it is with it considering both pokemon and the tree,

oak -> oak_(disambiguation)

and

orchish_(pixiv) -> oaks16
おーくす -> oaks16
大楠 -> oaks16
Ōkusu -> oaks16
okusu -> oaks16

Would be the better move in my opinion. Also don't know why orchish_(pixiv) is a tag for them lest it was a previous name.

Yeah, oaks16 is also their english nickname/handle in most places making it better suited even.

Not sure should we consider aliasing kanjis. Three tags in OP are the ones in constant use.

Aliased terms suggested by @Versperus. Cleaning out oak tag, will disambig soon. In the meantime, feel free to create a wiki page for oak_(disambiguation) if you wish

Mairo said:
Yeah, oaks16 is also their english nickname/handle in most places making it better suited even.

Not sure should we consider aliasing kanjis. Three tags in OP are the ones in constant use.

Sure, but if the kanji aren't aliased as well it stands to chance that images from pixiv can be posted under those names, leaving the poster none the wiser.