When referring to an online comment, I want to say
I agree with this guy.
However, it's not gender neutral (See this ELU post.)
What other informal alternate word is there? 'User' seems too formal, so does 'person' or 'fellow.'
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You could say
I agree with the commenter
I agree with them
I agree with this person
In fact, possibly the best is use their name (Kudos @Mynamite)
I agree with @jack
You can also use I agree with 'em. It uses singular they which is gender-neutral, and the omission of th gives it the air of informality requested. Double bonus that written it can't be confused for masculine-only 'im like it can in speech.
If you really want to use this in your sentence, you could go for an informal form of I agree with this one, although to be honest I can't think the best way to write it. with this'n will get the right pronunciation, although perhaps with this 'n' would be the most formally correct (it's a syllabic n after this in speech) although likely confused with the 'n' of and.