Novelty Font Tips
Novelty fonts map letters and numbers to playful symbols such as keycap digits and currency signs. They are best for short accents rather than full sentences.
Novelty maps are often partial. Currency letters, for example, only have good lookalikes for some letters, so the rest stay as normal text.
Keycap digits are emoji sequences, so they show on most modern platforms but may be blocked in some strict username fields. Test before saving.