J.A.R.V.I.S.

Who hasn't heard of Jarvis? Tony Stark's Personal Mechanical Assistant and Dark Crimsons' Ally in the Great Nightmare War, the Ultra Advanced system would be there in BTD 6.

J.A.R.V.I.S stands for Just A Rather Very Intelligent System

Role in BTD 6
When you first start the game, you are greeted by Jarvis, who explains to you the whole story. He explains that somewhere, in an alternate parallel universe, the Dimension Marvel Exists. Due to the consequences of the Great Nightmare War, and then the Infinity war with Thanos, All humans, animals and flora were wiped off the planet's face. Earth became Planet Thanos~112034. Dying Tony Stark's last wish was to transport Jarvis to another Universe, where he could help millions of other people. This wish was fulfilled by Thanos, and Tony Stark then was killed by him. Jarvis, although being an operating system, had feelings for his best friend. Now he exists for the sole purpose of helping the Monkeys in defeating the bloons, forever.

After hearing the sad story, Jarvis then cheers you up and asks whether to call you Sir or ''Ma'am. ''After you choose, he tells you the story of the previous bloon wars and asks you to help the monkeys in the 6thwar.

He then gives you the game tutorial and instructions and information on towers, ranks, items, upgrades and stuff newbies would require. He also gives you 1200 MM to start with.