The Most Interesting Dog I've Seen

It's a mo, because it doesn't have the little curl at the end and the next two are cha because the ya is smaller and is therefore paired with the previous character

It's Mecha. You're right about the cha and it being that way because it's paired with a smaller ya, but the first character is "め" (me) instead of mu (む), nu (ぬ), or mo (も)