43 characters in the Mro Unicode block.
U+16A40MRO LETTER TAU+16A41MRO LETTER NGIU+16A42MRO LETTER YOU+16A43MRO LETTER MIMU+16A44MRO LETTER BAU+16A45MRO LETTER DAU+16A46MRO LETTER AU+16A47MRO LETTER PHIU+16A48MRO LETTER KHAIU+16A49MRO LETTER HAOU+16A4AMRO LETTER DAIU+16A4BMRO LETTER CHUU+16A4CMRO LETTER KEAAEU+16A4DMRO LETTER OLU+16A4EMRO LETTER MAEMU+16A4FMRO LETTER NINU+16A50MRO LETTER PAU+16A51MRO LETTER OOU+16A52MRO LETTER OU+16A53MRO LETTER ROU+16A54MRO LETTER SHIU+16A55MRO LETTER THEAU+16A56MRO LETTER EAU+16A57MRO LETTER WAU+16A58MRO LETTER EU+16A59MRO LETTER KOU+16A5AMRO LETTER LANU+16A5BMRO LETTER LAU+16A5CMRO LETTER HAIU+16A5DMRO LETTER RIU+16A5EMRO LETTER TEKU+16A60MRO DIGIT ZEROU+16A61MRO DIGIT ONEU+16A62MRO DIGIT TWOU+16A63MRO DIGIT THREEU+16A64MRO DIGIT FOURU+16A65MRO DIGIT FIVEU+16A66MRO DIGIT SIXU+16A67MRO DIGIT SEVENU+16A68MRO DIGIT EIGHTU+16A69MRO DIGIT NINEU+16A6EMRO DANDAU+16A6FMRO DOUBLE DANDA