Merucik

Merucik is a Brainfuck derivative made by User:Conor O'Brien that adds some minor functionality to aid the programmer in coding. Merucik programs operator on a right-open, theoretically-unbound tape. Each cell can contain an arbitrary number.

Instructions
Merucik contains all the commands found in Brainfuck, and features the following added commands:

Hello, World! (1)
"Hello, World!"[.<]

Hello, World! (2)
This can probably be simplified more, but here is one using functions. F{++++++++++++}++++++++SS.S++.>f{}..+++.~>Sf{}.>S.SSf{2}-.#.+++.--.>SSf{3}.>S+. F{++++++++++++} (+12) ++++++++SS. (H) S++. (e) >f{}.. (ll) +++.~               (o; store to register) >Sf{}. (right and ,) >S. (right and ) SSf{2}-. (w) +++.                (r) --.             (l) >SSf{3}. (d) >S+. (!)
 * 1) .                  (o)

Computational Class
Merucik is Turing-complete by a trivial reduction to Brainfuck.