Is it grammatically correct to say, "A figure yonders"?
Solution 1:
In a poem, it's perfectly alright. Yonder as a word is dated, but not archaic. Yonders on the other hand is not listed in modern dictionaries, although it does seem to have been a variant of yonder:
Seven and a Half years in the Far West (1843):
he made yonders sun -- and yonders moon -- and all them' are stars what shines at night
The Italian Husband (1698)
drag him along to yonders wheel, there he shall endless tortures feel