This enemy is the Goliath to your David. He has incredibly high health and attack (though, oddly, not as much as the much smaller Manic Eraser), and a 1-in-4 chance, with every attack, to do a massive, extremely deadly shockwave. This attack will kill most Cats, and the extremely lucky survivors will be weak and slowed for a long time. Stacked Drama Cats and Dragon Cats can lay the hurt on him, but they will probably die if he does a shockwave.
You can stall him just like your own Crazed Titan Cat, by making it miss. The Gory Blacks that spawn in groups help you accomplish this by eliminating your meatshields that Manic Jameira would have attacked. If you didn't know already, if a cat or enemy that makes a shockwave misses their attack, there is a 0% chance for the shockwave to be made. You can exploit this to disable his shockwave ability, rendering him helpless to proper meatshielding.
Using Octopus Cat or cat Machine mk3 to negate that shockwave will not guarantee that your ranged attackers will survive. Because if his sheer damage and their inability to outrange the boss, Octopus will only be able to block the shockwave within a small window, and Cat Machine's survivability depends on if Manic Jamiera slows him or not. Also be wary that if the boss creates a shockwave on the same hit that your shockwave blocker dies, they will not block the shockwave, and every unit behind will get destroyed. The only shockwave blocker in the game to break this rule is Eva Unit-00, since she has 350 range and can outrange the boss, who only has 320 range.
If you have Eva Unit-00 from the Neon Genesis Evangelion collaboration gacha, this enemy is turned into a complete joke, as all of his shockwaves are negated, and she can outrange it. This means that you are able to stack cats that would normally not be a good idea to use, such as Lufalan Pasalan.
Manic Jamiera Cat
Time between attacks
22,000 damage (8,148.15 DPS)
320 (area attack)
0f (81f attack frequency)
47f (34f backswing)
Knock back all Cat Units (100%);
Slow down for 200f the movement of all Cat Units (50%);
Create lv.7 Shock Waves attack (25%)
*In each stage, there is strength magnification, the value of health and attack power varies due to this value.
*Time between attacks is the time of the attack from the motion end until the next attack motion start.
This enemy has the 5th highest hp at a 100% strength magnification