Tá sé ann féin
The literal translation is "He is there himself". Is the figurative meaning in English "He is a loner"?

I am not familiar with that one.

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It is recommended that you always wait for three to agree on a translation.
I speak Connemara Irish, and my input will often reflect that.
I will do an mp3 file on request for short translations.
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Dinneen has duine leis (ann) féin is ea é, meaning it can be either duine leis féin or duine ann féin, I presume.

It gives the meaning as "he is a man apart, a peculiar person." I suppose "loner" or even "a bit of an oddball" would also fit in that frame.

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Múinteoir Gaeilge - Irish Teacher
My "specialty" is Connemara Irish, particularly Cois Fhairrge dialect, but I can also speak Ulster and Munster Irish with native-level pronunciation.
Is fearr Gaeilge ḃriste ná Béarla cliste, cinnte, aċ i ḃfad níos fearr aríst í Gaeilge ḃinn ḃeo na nGaeltaċtaí.
Gaeilge Chonnacht (GC), go háraid Gaeilge Chois Fhairrge (GCF), Gaeilic Uladh (GU), Gaelainn na Mumhan (GM), agus Gaeilge an Chaighdeáin Oifigiúil (CO).