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We consider several vertex operator (super)algebras closely related to$V_{-1}(\frak{sl} (n) )$, $n \ge 3$ : (a) the parafermionic subalgebra$K(\frak{sl}(n),-1)$ for which we completely describe its inner structure, (b)the vacuum algebra $\Omega (V_{-1}(\frak{sl} (n) ) )$, and (c) an infiniteextension $\mathcal U$ of $V_{-1}(\frak{sl} (n) )$ constructed by combiningcertain irreducible ordinary modules with integral weights. It turns out that$\mathcal U$ is isomorphic to the coset vertex algebra $\frak{psl}(n|n) _1 /\frak{sl}(n)_1$, $n \ge 3$. We show that $V_{-1}(\frak{sl}(n))$ admitsprecisely $n$ ordinary irreducible modules, up to isomorphism. This leads tothe conjecture that ${\mathcal U}$ is {\em quasi-lisse}. We present evidence insupport of this conjecture: we prove that the (super)character of $\mathcal U$is quasi-modular of weight one by virtue of being the constant term of ameromorphic Jacobi form of index zero. Explicit formulas and MLDE forcharacters and supercharacters are given for $\frak{g}=\frak{sl}(3)$ andoutlined for general $n$. We present a conjectural family of 2nd order MLDEsfor characters of vertex algebras $\frak{psl}(n|n) _1$, $n \geq 2$. We finishwith a theorem pertaining to characters of $\frak{psl}(n|n)_1$ and $\mathcalU$-modules.

On some vertex algebras related to $V_{-1}(\frak{sl} (n) )$ and their characters