Mass of the Black Hole[]
Reimu is 140 pixels while the big Black Thing is 205 pixels. That's 1.46428571429 times higher. Average Japanese woman is 1.58 meters, so this black hole is 2.3135714285782 meters high.
Using the Hawking Radiation Calculator, this Black Hole would have a mass of 7.790582e+23 kilograms. That's even lower than the Earth so it's Low 5-B at best.
Ball of the Black Hole[]
But then we remember that said black hole is derived from a small ball that Suika throws. Which means that this ball has likely the mass of the entire black hole. Which means we can derive GBE from it. The ball is 0.1194539249146758 times Reimu's height, which means this thing is 18.8737201365187764 centimeters tall.
Mass is 779058200000000000000000 kg.
((3 x 0.0000000000667408) x (779058200000000000000000)^2) / 5 x 0.188737201365187790 = 4587118670565099712571195933205806208 joules. Or 5-A. Well then.
Ball is Thrown[]
But
BUT
We still have KE left.
In a single frame, the very same "Black Hole ball" moves at 9 pixels per frame. Compared to Okuu's light particle speed seen in my old blog, this is 0.0697674418604651 times the speed of light, meaning 20915752,88 m/s.
Plugging this into the KE calculator with the mass calculated above, this gives us 1.7040679620995984e+38 joules, which is Large Planet level+. AAAAAAAAAAAAAAAA
Ball is Thrown but Faster[]
BUT. BUT. BUUUUUUUUUUT.
A faster version of Suika's move exists. This one moves 38 pixels per frames. Meaning it moves at 0.2945736434108527 times the speed of light, or 88310956,62 m/s.
Again, using the KE calculator, we reach 3.037869306344065e+39 joules. Which is quite high end High 5-A.
Calc but HD, feat. Executor[]
Basically, I got some conversions wrong so have the fixed version:
m = (1.15678571 * 299792458²) / (2 * 6.67408e-11)
mass = 7.78884241e+26 kilograms
The part before the "e+" explains the difference by the calculator using a constant with more or less numbers. But a difference of 10^3 times in the order of magnitude is not something expected.
The reason ? You have not changed the mass dimension used in the calculator, it has the default "metric tons" and you forgot to switch to kilograms. Making the change the result is: 7.790582e+26 kg.
7.790582e+26 kg = 0.000391663667 solar masses
Solar mass * Sun GBE
0.000391663667 * 3.8e+41 Joules = 1.4883219e+38, 5-A+
Continuing
Ball GBE = (3 * 6.67408e-11 * 7.790582e+26²) / (5 * 0.0943686005)
Ball GBE = 2.57546084e44 Joules, High 4-C
Low Speed KE = 0.5 * 7.790582e+26 * 20915752.88² = 1.70406796e41 Joules, Low 4-C
High Speed KE = 0.5 * 7.790582e+26 * 88310956.62² = 3.03786931e42 Joules, High 4-C.