So somebody like a Dark Souls character or a MOBA character? From what I remember, we put equipment that they've been shown to use in promotional material like box art and/or starting equipment (what they start the game with) as standard equipment. Everything they get after is in optional equipment. For things like spells, we put them in P&A and Notable Attacks/Techniques, but it should be noted that it's something they get at this point, etc.
In terms of VS threads, different builds can practically be treated in the same way as different keys or even different characters. You just need to add it in the further context and clarify what they have for that match. So for example, it'd look something like:
Jin Mori vs. the Ashen One
Ragnarok Arc Monkey King Mode Mori and End of Game Ashen One are used (High 4-C versions)
Ashen One has the Pyromancy Flame and Chaos Bed Vestiges, Great Chaos Fire Orb, Chaos Storm, and Fire Whip
So as long as you give enough context, then the match can go smoothly and possibly be added to the wiki's profiles. If what you made is a stomp, then that's too bad.