For MyKid, you can proceed to JPN to apply once you have received the citizenship certificate. Please bring your IC as well.
If you are already 12 years old, you will need to apply for MyKad. You can go to JPN and apply for your MyKad as usual.
If you are above 16 years old, the MyKad process may be a bit more complicated. Here is the process:
Receive decision letter from KDN > If successful, take the letter to JPN > Collect citizenship certificate at JPN > Fill out the IC application form at JPN under the category ‘daftar lewat’ > JPN will call for an interview > Wait 6 months for the result > Receive IC approval letter, which states requires renunciation another citizenship > Take the approval letter to the embassy to renounce previous citizenship > Obtain the renunciation completion letter from the embassy > Return the completion letter to JPN > Wait for IC issuance > Collect the IC
By law, you are only required to renounce your previous citizenship once you turn 18, so it’s best to confirm with the JPN officer.