Ace is the name of a player that periodically appears on weekdays, 12:00-12:24 PM. They will always do team mode, and they are conceived to be good at Defly.io.
For some time now, Ace has been periodically appearing on U.S. East Team Mode servers. He is said to be a very skilled player, but it is questionable whether they are an actual player, or a bot, as their appearances are consistent, and they very rarely chat. Another reason why they may just be a bot is that nobody else can name their helicopter "Ace"
Ace will usually choose aggressive upgrades when they level up, such as increasing rate of fire, bullet speed, bullet range, and player speed. When they get to level 20, they will usually choose the flash bang upgrade.
"Ace" was also the name of a player that periodically appeared on wings.io at a similar schedule.