I'm sure Buront from the comic series is what's being referenced, but the armor is regular Paladin artifact armor. Should the tag stay? I'm not sure about this one

Google Translate of tags:
child Bron
Oriental Rapture
Thighs

Seems to me that the image is specifically meant to reference Buront, so the tag belongs.

It's "Buronko"
the "ko" is the 子 which can be spelled "shi" (TenSHI) or "ko" (Tenko).

Tenshi is, in both name and reality, the ultimate tank.

What's the connection between Tenshi and Buront?

And why they're often seen together on some pics?

So is this an if_they_mated, fusion, or cosplay?

iny said:
What's the connection between Tenshi and Buront?

And why they're often seen together on some pics?

Both of them have the same keyword, "uchouten."
This word originally means Bhava-agra, another name of the highest heaven. Now this word usually means "rapture" or "ecstasy".
"My rage has reached 'uchouten'(rapture)" is one of the most well known Burontism. The correct sentence was "my rage has reached 'chouten' (a peak)".

sir_burpalot21 said:
So is this an if_they_mated, fusion, or cosplay?

Buronko's true identity varies by the artists. The worst case is she is the genderswapped Buront.

iny said:
What's the connection between Tenshi and Buront?

And why they're often seen together on some pics?

One of the earlier Touhou/Buront fanworks had him matched up with Tenshi and Okuu, and mixed in monster hunter.

She might have popped up in other early works (IoYaY isn't the first such mix of Buront and Touhou, but it's the best known)