I'm seeing the same thing in bash, and it really seems to be at the
application level. Here's an strace of it trying to read the £ sign:

read(0, "\302", 1)                      = 1
write(2, "\302", 1)                     = 1
rt_sigprocmask(SIG_BLOCK, NULL, [], 8)  = 0
read(0, "\243", 1)                      = 1
rt_sigprocmask(SIG_BLOCK, NULL, [], 8)  = 0
rt_sigprocmask(SIG_BLOCK, NULL, [], 8)  = 0
read(0,

In other words, the console is feeding it the right characters, but it's
dropping the second of the two bytes in the UTF-8 representation.

Or ğ:

read(0, "\304", 1)                      = 1
write(2, "\302", 1)                     = 1
rt_sigprocmask(SIG_BLOCK, NULL, [], 8)  = 0
read(0, "\237", 1)                      = 1
write(2, "\304\237", 2)                 = 2
rt_sigprocmask(SIG_BLOCK, NULL, [], 8)  = 0
read(0,

Now, this is actually in X, not at the console, but bash at the console
produced the exact same trace with the £ sign. dash doesn't exhibit
quite the same effects, although it does fail to correctly backspace
over UTF-8 characters.

I know this isn't quite your original problem, but bash is a lot easier
to debug interactively than login. I'm hoping that if I can see the
systemic problem this way then login will be an easier target.

-- 
non-ascii layout/encoding problems at "login" line
https://bugs.launchpad.net/bugs/273189
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