It can be hard to bring someone new in an established game. I've done it with success, but for every time it has worked, there are three times that number that have bitten me in the ass. It really depends on the player.
IF, you want to bring in a new player...not to take over Tip, but to play a new character...I wouldn't put out an all-call in the "Looking for gamers" forum. Between the four of us, I believe we can come up with a player who would be good to game with and contribute to the group effort.
And whether you decide to add a new player or not, I would discourage you from running more than one NPC. You have enough NPC's to deal with anyway in the game itself (Hennoth being just one).
As a player, I'm good with the game; it is one of two I play on here and I like running Graela.
As a DM though, I can understand if you want to put it on hiatus or shut it down altogether.
Whatever works best for you, man!
