During its time with Mallow and Tsareena, Shaymin has grown close to them. This was seen in Drawn with the Wind!, when her headband was blown away in the wind, Shaymin chased after it to retrieve it. Shaymin is a compassionate Pokémon, being naturally drawn to other to feelings of thankfulness. It appears to be meek and adverse to fighting, as seen in Drawn with the Wind!, where it cowered behind Sandy and Ash's Meltan when confronted by Team Rocket. At the same time, its compassion leads it to risk itself in order to help others, as seen in the beginning of the episode, where it shoved Sandy out of the way of oncoming traffic, and later, when it cured Sandy of poison. Mallow surmises this might be in part due to Tsareena's influence.
It has a playful personality; in A Grand Debut!, it and Snowy ran to the sea and then back whenever waves would come in. Due to its playfulness, despite only meeting Mallow the previous day, Shaymin seems to be a fairly outgoing and extroverted Pokémon.
In its Land Forme, Shaymin is not very agile, often needing assistance from Sandy to climb objects such as barrels or boxes.