| Event | Time | Meet | Date |
|---|---|---|---|
| 100m Backstroke | 1:13.26 | 2026 Ontario Age Groups - MPAC | 2026-03-05 |
| 100m Backstroke | 1:08.62 | Western Region Short Course Championships | 2026-02-12 |
| 100m Breaststroke | 1:31.42 | CAJ In-House Meet #2 | 2025-11-22 |
| 100m Butterfly | 1:09.63 | 2026 Ontario Age Groups - MPAC | 2026-03-05 |
| 100m Butterfly | 1:08.67 | Western Region Short Course Championships | 2026-02-12 |
| 100m Freestyle | 1:05.66 | Western Region Long Course Championships | 2025-06-13 |
| 100m Freestyle | 1:04.17 | BAC Team Showdown 2025 | 2025-12-12 |
| 100m IM | 1:16.01 | 2025 MMST Dash 4 Cash | 2025-10-18 |
| 200m Backstroke | 2:40.67 | 2026 Ontario Age Groups - MPAC | 2026-03-05 |
| 200m Backstroke | 2:27.87 | Western Region Short Course Championships | 2026-02-12 |
| 200m Butterfly | 2:50.18 | 2026 Mallards Winter LC Invitational | 2026-01-30 |
| 200m Butterfly | 2:40.65 | 2025 NYAC Cup | 2025-11-14 |
| 200m Freestyle | 2:23.85 | Western Region Long Course Championships | 2025-06-13 |
| 200m Freestyle | 2:19.22 | Western Region Short Course Championships | 2026-02-12 |
| 200m IM | 2:46.67 | 2026 Mallards Winter LC Invitational | 2026-01-30 |
| 200m IM | 2:49.35 | Dean Boles Invitational Meet | 2026-01-10 |
| 400m Freestyle | 5:11.26 | 2026 Mallards Winter LC Invitational | 2026-01-30 |
| 400m Freestyle | 5:08.31 | 2025 NYAC Cup | 2025-11-14 |
| 50m Backstroke | 33.21 | 2026 Ontario Age Groups - MPAC | 2026-03-05 |
| 50m Backstroke | 31.76 | Western Region Short Course Championships | 2026-02-12 |
| 50m Breaststroke | 41.54 | 2026 Mallards Winter LC Invitational | 2026-01-30 |
| 50m Breaststroke | 42.95 | CAJ In-House Meet #1 | 2025-10-25 |
| 50m Butterfly | 30.94 | 2026 Ontario Age Groups - MPAC | 2026-03-05 |
| 50m Butterfly | 30.26 | Western Region Short Course Championships | 2026-02-12 |
| 50m Freestyle | 29.80 | BAC Team Showdown 2025 | 2025-12-12 |
| 800m Freestyle | 10:41.26 | 2026 Mallards Winter LC Invitational | 2026-01-30 |
| 800m Freestyle | 10:18.48 | Western Region Short Course Championships | 2026-02-12 |
Nichols, Addyson's top personal bests include 100m Backstroke (1:13.26), 100m Backstroke (1:08.62), 100m Breaststroke (1:31.42), 100m Butterfly (1:09.63), 100m Butterfly (1:08.67).
Nichols, Addyson swims for Cambridge Aquajets.
Nichols, Addyson has competed in 10 meets.