First prepare a background transparent png image, the proposed size of 300 * 300 or more
Open ready png image with AI tool (I use CC)
Window on the toolbar, select an image copy
Click tracing, and then close.
View on the toolbar, select Show Transparency Grid
The image becomes as follows:
Click on the object on the toolbar, select the extension, OK
Switch to direct selection tool
Double-click the white area, then press Delete to delete, you can eliminate the white areas
Save the file as svg format.
Open IcoMoon website https://icomoon.io/app/#/select, ready to upload the svg map, you can create a character icon
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