▁criminal ▁investigation ▁( The ▁Myst ery ▁of ▁the ▁Un l ucky ▁Und ert aker ). ▁He ▁is ▁engaged ▁to ▁G rac ie ▁So h ▁in ▁The ▁Myst ery ▁of ▁the ▁Dead ▁D iva . ▁G rac ie ▁So h : ▁Al vin ' s ▁mother . ▁O wn s ▁a ▁j ew el ry ▁shop . ▁She ▁has ▁a ▁rom antic ▁relationship ▁with ▁Serge ant ▁So o . ▁She ▁is ▁often ▁wor ried ▁about ▁Al vin ' s ▁safety ▁during ▁his ▁investig ations , ▁especially ▁after ▁she ▁finds ▁out ▁how ▁Alan ▁So h ▁and ▁Sin ch ita ▁were ▁killed . ▁She ▁is ▁engaged ▁to ▁Serge ant ▁So o . ▁The ▁S nake : ▁Master ▁criminal , ▁leader ▁of ▁the ▁city ' s ▁largest ▁crime ▁synd icate . ▁Al vin ' s ▁dead liest ▁enemy . ▁He ▁often ▁we ars ▁a ▁green - re pt ile ▁mask ▁and ▁he ▁never ▁takes ▁it ▁off . ▁He ▁is ▁extremely ▁dangerous ▁and ▁always ▁tries ▁to ▁get ▁rid ▁of ▁Al vin ▁and ▁his ▁team ▁as ▁they ▁always ▁out sm art ▁him . ▁In ▁The ▁Myst ery ▁of ▁the ▁Raj ah ' s ▁Ruby , ▁it ▁is ▁revealed ▁he ▁has ▁a ▁daughter , ▁Tai . ▁ ▁Tai : ▁Her ▁full ▁name ▁is ▁Tai ▁Pan , ▁based ▁on ▁a ▁dead ly ▁poison ous ▁s nake ' s ▁name . ▁She ▁is ▁very ▁beautiful , ▁and ▁Al vin ▁used ▁to ▁date ▁her ▁until ▁Mars ▁gave ▁him ▁a ▁warning . ▁Tai ▁often ▁goes ▁against ▁her ▁father ' s ▁will ▁and ▁war ns