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There probably wouldn't be a trope that combines the two traits because it'd fall under The Same, but More Specific — specifically the part that says "a combination of article X and article Y".
So the question is, how are they annoying? Do they relentlessly correct other people's grammar? Then the character would just be "Usually a Nice Guy, but becomes a pedantic Grammar Nazi over the smallest mistakes."
What I’m thinking of is a character who is genuinely friendly and kind, but nevertheless ends up being very annoying to other characters for a reason that doesn’t relate to their kindness (such as being extremely talkative, stupid, etc).
back lol
The Gadfly is deliberately annoying; I’m thinking mainly of unintentional annoyance.
back lol
In that case, Innocently Insensitive (paragraph 2).
Edited by MiinU
A character is a Nice Guy, but is nevertheless very annoying.