Kuala Lumpur - Narita Airport transit - Toronto Pearson Airport, do you need to collect your luggage at Narita Airport before checking it in again?

With the same airline, generally speaking, there is no need to check in the luggage again. If with a different airline, it is usually necessary to check in the luggage again after picking it up. You must communicate this matter before boarding. The transfer time should generally be more than 2 hours.
With the same airline, generally, it is not necessary to check in again. If with a different airline, it usually requires re-checking the luggage. You must communicate this matter before boarding. The transfer time is generally more than 2 hours, which is more appropriate.