Katakana handwriting requires careful attention. Small differences in stroke length and angle matter. If you are not careful, some katakana can become hard to tell apart from other katakana or hiragana characters.

a and ma

Katakana ア and マ may become indistinguishable.
ya and ma

Katakana ヤ and マ may become indistinguishable.
ku and ke

Katakana ク and ケ may become indistinguishable.
ku and wa

Katakana ク and ワ may become indistinguishable.
na and me

Katakana ナ and メ may become indistinguishable.
ko and yu

Katakana コ and ユ may become indistinguishable.
tsu and shi

Katakana ツ may シ become indistinguishable.
so and nn

Katakana ソ may look like ン or the other way around.
shi and nn

Katakana シ may look like ン or the other way around.
te and ra

Katakana テ and ラ become indistinguishable.
chi and te

Katakana チ and テbecome indistinguishable.
ka and ka

Katakana カ may look like hiragana か or the other way around.
se and se

Katakana セ may look like hiragana せ or the other way around.
ya and ya

Katakana ヤ may look like hiragana や or the other way around.
ri and ri

Katakana リ may look like hiragana り or the other way around.
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