Bbb23 username generator!
I gave it a try:
Ppp10, Nnn36, Aaa86, Lll48, Iii94, Kkk36, Zzz70, Ooo12, Uuu04, Ggg51, Sss09, Fff32, Kkk26, Bbb16, Lll11, Yyy28, Sss77, Ggg63, Uuu12, Bbb10, Mmm38, Iii97, Ggg07, Ggg98, Iii08, Ccc68, Zzz49, Jjj90, Sss40, Xxx00, Zzz53, Lll89, Qqq97, Hhh36, Aaa69, Rrr39, Uuu51, Www11, Hhh37, Mmm77, Ccc41, Vvv70, Lll64, Ggg76, Rrr43, Bbb21, Ppp27, Ggg72, Fff33, Ooo03, Jjj10, Xxx76, Yyy74, Lll38, Fff04, Nnn46, Ccc71, Fff06, Ttt47, Sss77, Ttt10, Qqq77, Mmm10, Ddd37, Uuu74, Mmm86, Ggg22, Sss57, Uuu95, Qqq75, Qqq25, Kkk67, Sss96, Hhh69, Ppp12, Ppp26, Zzz60, Ddd15, Vvv69, Uuu11, Yyy55, Ooo98, Ddd24, Lll31, Rrr49, Ooo29, Yyy61, Www86, Ggg71, Aaa64, Vvv24, Zzz47, Aaa23, Bbb18, Ooo84, Ooo89, Ggg05, Kkk89, Iii73, Zzz29, Nnn34, Ggg74, Rrr84, Hhh05, Iii09, Ddd24, Zzz71, Fff13
Better avoid these user names.
Bbb23 sounds like a spammer's user name, and Bbb23 is indeed disruptive. All the time.