There's a lot to unpack in this complaint, but I'll try to be brief.
-I do not agree with your assessment that Kelvin is a non-character meant to house the "Antag" powers as you say. I do have a character for him he has a personality, likes and dislikes, and friends.
-As for the round mentioned, there was a lot of roleplay leading up to Thompson's near death, I telegraphed early in the round that Kelvin was out to get him, and it involved the entire cargo department, that was close to full at the time. Events including arguments at the cargo desk, a meeting with the quartermaster and a would be meeting with the captain.
-The reason I was using vampire powers was to avoid a fight with security. While I do agree that staying in the walls in the transfer shuttle was kind of bad on my side, my intention was to make a scene similar to a horror movie where the monster gets through a seemingly impenetrable defense and escapes. I could have made this more clear.
-While I sometimes cryo about an hour in after there's been little going on in cargo and I'm getting bored, it is not particularly uncommon practice, indeed a lot of players do this, it is NOT because I didn't roll antag, although it would be bad manners to do so if I had rolled antag.
-It is hard to defend myself against sweeping statements like this:
"It has reached an excruciating point where anybody could meta if Kelvin is even within the vicinity of cargo to guess whether or not he's an antagonist. He does this the majority of times, and will use any tool necessary to the point of (borderline) powergaming to accomplish adding another point to his "win-ratio"
And I feel that Ricky does not provide sufficient evidence to back it up. In general, I feel the complaint is very aggressively worded. I did get positive feedback from people playing cargo for the round in question.
To conclude, I think it ultimately would've been a better move to talk to me directly through DMs about any concerns rather than writing up a public complaint.