New Black hole mass class

U: Ultramassive black holes (needs 10B+ Juno masses to become one)(Status: Extremely Rare.)
Q: Quasars (108+ Juno masses aka Juno solar masses to become one or 50M to become one?)(Status: Very Rare)
S: SMBHs (105 Juno masses to become one)(Status: rare, because almost every galaxy has a center?)
I: IMBH (100 Juno masses to become one) (Status: Rare?)
II: Stellar mass black holes (1-2 Juno masses to become one?) (Status: Dominant?)
P: Primordial black holes (0.000000001 kg to become one?)(Status: Extinct)