Namo, often called Mandos, probably the wisest among the Valar.
Indoubtedly my most favourite Vala (alongside with Irmo).
Quite oriental vision of him (a sage/priest mixed with a samurai). In fact his "profession" has a lot in common with the priesthood.
Although this image may also suit Irmo, the Lord of Dreams, the younger brother of Namo.
Mandos/Namo & Lorien/Irmo (c) JRRT "Silmarillion"