A long time ago I let a person in my hyena group. She kind of seemed weird but I just ignored it to not be rude. At the time I only had FH+ (Don't ask...) and I had never been in The Cape on normal FH so this was partly my fault. I did not know FH+ and FH had different Cape maps. So I wanted her to go to a place she couldn't on FH. Finally she got mad and gave me her password so I could put her in it. So I went on thinking she was lucky I wasn't a hacker. Also I noticed that all of her characters where named Laddy. Is it normal to have all the same names? I think she was not smart to give away her password like that and she may have been hacked by now if she has done it again.
I agree with the people above, and I'd go as far as to say you should NEVER give out your password to anyone - regardless the reason why. And if you still do it there is no excuses if this action causes your account to be banned - you can never know what the other person are doing on your account.
This person was very lucky that it was a nice and helpful floof such as yourself that she gave out her password to.
Also as Rami said I too dislike that she did this in anger.
And yes it's common that some make several copies of the same character and use the same name on all.
I myself have characters named different things - but also a few that is simple named "Shallow" ^.^