You can find someones profile by clicking on the first letter of their username then selecting their name from the list

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Jagroth
JAHAMAN54321
James CF
james93
JamesBond
jamesking
jameson
jamie
Jango
Jason
jasper
jay03arrr
Jayjay
JaySin
jblu
jeannie
jen
Jenjen
jenmmcfarland
jenni_pie
jenny
jeriah
jess
jessica rabbit
jesuslewis
Jigga_In_Cuffs
Jimi
JimiTheGent
jinnymo
Jipster
JM0N3Y1
Joanne
Joe
JoeClark
JoeWilles
John
John Sampson
Johnh
johntal
Jola
Jonathan
Jondo
Jonny
Joolie
JooliePeaches
Jordan
Josh
joy
JtB
julie
Julz
justin_sane