NyaaPlayerCoser (NPC) plugin.
/npc spawn VILLAGER TRADER_UNLIMITED TestNpc
/npc edit help
/npc edit 0 trade:+
/npc edit 0 trade:+<existing_trade_id>
/npc edit 0 trade:-<trade_id>
/npc edit 0 trade:<trade_id>,<trade_id>,...
/npc edit_trade <trade_id>
/npc travel disable <npcId>
/npc travel enable <npcId> <pstMinSec> <pstMaxSec> <absMinSec> <absMaxSec> <tradeMin> <tradeMax> <rndXZMax> <rndYPosMax> <rndYNegMax> <rndTryMax>
/npc travel force_move <npcId>
/npc inspect nearby
/npc inspect nearby 5
/npc inspect npc 0
/npc inspect trade 0
Custom skin if NPC's entity type is PLAYER
. Skin info can be obtained from https://mineskin.org/
/npc spawn PLAYER TRADER_UNLIMITED <npc_id>
/npc skin add <skin_id> <texture_value> <texture_signature>
/npc edit <npc_id> skin:<skin_id>
/npc edit <npc_id> skin:default