Random Riddle: String Them Together

First think of a person who lives in disguise,
who deals in secrets and tells naught but lies.
Next tell me what is always the last thing to mend,
the middle of middle the end of the end?
And finally give me a sound often heard during the search of a hard-to-find word.
Now string them together and answer me this,
which creature would you be unwilling to kiss?
 
Random Riddle: String Them Together