The character を is pronounced as o, just like the character お, although some people pronounce it as wo when reading a hiragana table. を(o) is exclusively used as a grammatical particle.

The character ん (n) forms an independent syllable for Japanese although it is a consonant.

は is read as wa when used as a topic-marking particle, but it is read as ha in all other contexts.

Similarly, へ is read as e when used as a direction-marking particle, but it is read as he in all other contexts.