Ovaltine the Miltank (pictured left): she's spent a giant portion of her life on Tao Ranch... or at least, as much of it as she can remember. She's siblings with Malt, the brown Miltank. She has a bit of a temper but works hard to help produce milk and helps Iceburg and Strawberry a lot in the fields when it's needed (which is quite often). She's very close to Iceburg and prefers to spend her free time around him, for whatever reason.
Malt the Miltank (pictured right): he spent a lot of his time as a kid learning to do math and use his father's abacus. Where he could have been helping in the fields, he chose to do paperwork and keeping track of the farm's expenses. He also prefers to be referred to as a boy and gets severely agitated when people enter the shop and go "miss," "ma'am," etc.
Ovaltine's teased Malt quite a lot for not helping out with production like most Miltank. As of Mission 2 it had caused a lot of strain on their relationship that he spent most of his time indoors instead of putting his strength to good use.
edit: For those who can't read, Malt identifies as a male regardless of whatever its actual sex may be.