Struggling to beat lvl 100 bunker? Here are some tips for ya!
Firstly you need to have around combined power level 200,000. Its important to note that in bunker the strength of your individual characters is the average of your total, so having a single character at 70,000 power and 2 others at 50,000 will make each char have a power of around 56,666 and you will not be able to beat it.
When you are level 200,000 you should easily be able to reach level 100, if you aren't then dodge bullets better! :)
My setup is as follows:
Jack -> Jade -> TNT.
TNT is the only character able to take a hit from the boss and survive, and her stun ability is very helpful for the final boss, definitely have it ready for last.
You should be able to arrive at level 100 with all 3 chars alive, make sure you focus the small enemies first, do not hold any big attack use everything to kill the small ones. When one of your character dies, your new one is not only invincible for a few seconds but his attack power is multipled; make sure you use this window to destroy small adds and not waste bullets on the boss!
If you are able to beat all the small enemies and still be alive, congratulations, you are geared enough to beat the final boss as no amount of extra gear can make the rest of the fight any easier.

The boss itself has 3 moves:
A - Forward slash: you can dodge it by double jumping at the right time, or simply crossing behind him. Despite the huge looking animation he only hits in front of him.
He will only do this move if you are within close range of him.
B - Sky dive: This is probably the hardest move to dodge as it can catch you by surprise, you need to move moving as soon as he starts his jump and double jump at the right time to avoid the wave coming at you. Do not hesitate here and do not change direction.
He will only do this move if you are at far range of him.
C - Charge attack: He will do this move randomly during the fight, he will spawn on 1 side of the arena, and charge across to the other side. If you are close to where he starts, double jump right away, otherwise wait for him to start the charge and time it accordingly.
There is no way to bait or manipulate this attack, it will happen.

Now that we've covered the moves, lets look at the strategy:
You want to stay close to him to bait him into using attack A as it is the easiest to dodge, simply cross the boss or jump behind him when the attack is due.
Its best to stay near the middle of the map, so that when he does his charge attack you can go far from where he spawns, he will charge towards you, jump at the right time and then you are still close to him to bait attack A.
When you are using TNT, do not try to summon the drone if the boss is not stunned, this can cost you your life as you might be stuck in animation while he attacks you.


All in all, once you clear the small enemies, stay calm, dont panic and take the time you need to kill him! Good luck!