This is a Quasar at z = 6.94, the highest z I have found in this survey so far.
https://www.legacysurvey.org//viewer-dev/?ra=12.1936&dec=-0.7700&layer=ls-dr9&zoom=16&spectra
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Hi there,
That would certainly be a very high-redshift quasar! DESI also has a spectrum of it, but measured to be at redshift z=0.93. It was weird enough looking that I asked my DESI quasar colleagues about it, and there were many comments!
Here’s the HSC imaging and a link to the DESI spectrum:
https://www.legacysurvey.org//viewer/?ra=12.1935&dec=-0.7730&layer=hsc-dr3&zoom=16&desi-spec-dr1
Matthew Temple said that the [OIII] profile looks like the red (dusty) quasars in https://arxiv.org/pdf/1906.00980
Victoria Fawcett said:
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I think it has the redshift correct at 0.93 - […] the [OIII] is just very blended, indicating a very powerful outflow. This is also why we see other forbidden lines that are very broad and blueshifted, the lines at ~6500 A are [NeV].
I am also surprised that we don’t see Hbeta, although you do see broad MgII.
The z-W2 colour is also pretty red, indicating it might be an Extremely Red Quasar (ERQ), like the ones in the paper Matthew has linked.
These are super rare objects!
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cheers,
dustin
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Oh well, I guess it is cool that it is super rare 
I will definitely check out the paper, thanks.