AtomicMari is the personal channel of Mari Takahashi. It was launched on January 1, 2013. The channel does not have a schedule or a certain video guideline.
In the opening video, Mari stated "...perhaps where this channel is going isn't really clear cut just at this moment,". The channel currently has less than 250,000 subscribers and 15 videos. The last video was uploaded over a year ago.
- Mari's videos cover a range of topics, from vlogs and dance videos to mail time and tags. She also has two basic Japanese lesson videos up, titled "Japanese Quicki"
- Most of the Smosh Games crew were featured in her "Quicki" videos, including Sohinki, Jovenshire, Lasercorn, and Wes.
- After the closure of Defy Media, AtomicMari was briefly renamed "Mari Takahashi". However, by January 2019 the channel once again had its former name.