| 1. Martin's father is Guyanese and his mother is Danish, they met in the United States. |
| 2. His father's surname was originally Brathwaite but was changed to Braithwaite when he arrived in the U.S. |
| 3. From a young age, Martin dreamed of being a footballer; his local newspaper captured a picture of him kicking a ball when he was just two years old. |
| 4. He suffered from Legg-Calve-Perthes disease in childhood, leading to two years in a wheelchair from ages 5 to 7. |
| 5. His football journey began at Sædding-Guldager Idrætsforening before joining Esbjerg fB in 2007, where he won the Danish Cup in the 2012–13 season. |
| 6. He is a philanthropist and runs a clothing brand 'Trente' with his wife. |
| 7. Although he was offered a chance to represent Guyana in international football in 2012, he declined. |
| 8. Martin was sold to Toulouse FC in 2013 for approximately €2 million. |
| 9. His first senior international goal was against Poland in August 2013. |
| 10. In 2017, he started investing in real estate with an initial investment of €850,000. |
| 11. He joined CD Leganés on loan during the January 2019 transfer window and scored against Real Madrid. |
| 12. Martin's first Spanish league goal was for CD Leganés against FC Barcelona. |
| 13. He signed with FC Barcelona in February 2020 after they activated his release clause of €18 million. |
| 14. His first goal for Barcelona was assisted by Lionel Messi. |
| 15. FC Barcelona was allowed an emergency transfer to sign Martin due to Ousmane Dembélé's injury. |
| 16. He has invested in several restaurants in France and Spain. |
| 17. His first UEFA Champions League goal was against FC Dynamo Kyiv. |
| 18. Martin won the Copa Del Rey title with FC Barcelona in the 2020-21 season. |
| 19. He left Barcelona in September 2022 after a mutual agreement to terminate his contract. |
| 20. Martin is multilingual, speaking English, Spanish, French, and Danish. |
| 21. He represented Denmark in the 2018 FIFA World Cup, UEFA Euro 2020, and 2022 FIFA World Cup. |
| 22. He and his brother invested ÂŁ617,000 into NYCE Companies, which significantly increased in value by August 2024. |
| 23. He expressed interest in purchasing stakes in Espanyol FC after leaving the club. |
