You know the fire monkey in bcs(Bloons card storm). Simple 1 of 4 characters and my personal favourite. I will talk about how to play Gwendoline this also shouldn't be super long. So Gwendoline has three abilities. Her first ability that sets enemies on fire which does 30 dmg per turn, her second makes all your monkeys get 5 dmg boost and her third ability sets all enemy bloons on fire(If there already on fire they take 200 dmg).

Gwendoline's first ability sets a single enemy bloon on fire. Usually i don't use this ability but its really good against bloons that still have a few turns before attacking. Its also a good setup for your third ability which can do massive dmg to bloons already on fire. Never use it to deal dmg to a bloon that's one turn or about to attack as 30-60 isn't worth using a ability unless the attack is lethal.

Gwendolin's second ability gives 5 bonus dmg to all of your monkey's. Make sure if you have your second ability make sure to use all your attacks(Besides defence towers) first so you can use Gwendolin's first or third ability and still get your bonus damage. If you don't have it yet you can place a bloon to get enough bloontonium then attack so you get that bonus 5 attack dmg. All ways make sure to use Gwendolin's second ability as 5 dmg for all of your monkeys can still do a lot.

Gwendolin's third ability sets all enemy bloons on fire or 200 dmg to bloons already on fire. This ability can be insanely useful to kill or heavily dmg enemy bloons. This attack will drain all of Gwendolin's blootonium so use Gwendolin's second ability first. and if needed use Gwendolin's first ability place a 5 coin bloon and use her third ability to do tons of dmg.