Can somebody explain the purpose of ぉ character in the end of the following sentence?
What part of speech can be assigned to ぉ ?
Can the ending の be glued up with ぉ?
It seems to just be an emphatic, stylistic lengthening of the
の preceding it.
The のぉ is what we normally write as 「のう」, one of the sentence ending particles (終助詞). I think it sounds rather archaic, now we think it's only used by older people (but I doubt it's actually used daily anymore... I think we only see it in books, anime or manga...), and younger people don't use it in "normal" conversation. I think it's probably the archaic equivalent for ね/ねえ/ねぇ or maybe な/なあ.
It has a different intonation from the sentence ending particle の. Here're my voice recordings ^^
「のう」・・・「やられた↗のう↘。(The subject is probably the hearer.)」
「の」・・・「どうした↘の～↗？(The subject is the hearer.)」－－「やられた↘の～↘。(The subject is the speaker.)」