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For example, someone who was born without an arm, or has an extra leg and
wants to be able to express this in words. Or perhaps in a fantasy setting
have retractable wings, and wants to tell people this.

"I have wings"  
"I have an extra arm"  
"I only have nine fingers" etc.
CC BY-SA 3.0
2017-10-25T11:24:45.620
54036
2017-10-25T12:07:19.360
2017-10-25T11:33:03.450
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question
phrase-requests
How do you say that you have/do not have a body part
> （何に）手・足・胃・頭・鼻 がある。 (X has) a hand/leg/stomach/head/nose.

should be sufficient.

If you need to quantify, you could say

> 狼男には耳が２つある。 A werewolf has two ears.
CC BY-SA 3.0
2017-10-25T12:07:19.360
54037
2017-10-25T12:07:19.360
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answer