How can I make cool font by my own for copy and paste?

Adobe Illustrator can be used as a cool font maker. It has built-in feature to let you easily create vector based images with copy and paste.

How to make cool font for copy and paste:

1. Create a new document (e.g., 1000×1000 px) and enable Grid and Rulers to maintain consistent letter heights.
2. Use the Pen Tool, Shape Builder Tool, and Pathfinder to draw your first few key letters (start with "n", "o", "H", and "O").
3. Place each letter on a separate artboard or named layer, and expand all strokes (Object → Path → Outline Stroke).
4. Add vertical guide lines on each letter to set consistent left and right side-bearing spacing.
5. Export each completed letter individually as an SVG file (File → Export → Export As → SVG).
6. Import each SVG into a font editor like FontForge, Glyphs, or Calligraphr, matching each letter to its correct glyph slot.
7. Adjust kerning and spacing between letter pairs (e.g., "AV", "To") within the font software.
8. Generate and export your font as a .ttf or .otf file, then install it on your computer for use.

However, Illustrator itself cannot export a functional font file (like .ttf or .otf). Instead, you use it to design each character, then export those designs to a specialized font-creation program for final assembly. This workflow is favored by professional type designers because it combines Illustrator's powerful drawing tools with dedicated font software's technical requirements.