1.
this (proximal location to speaker); these.
Here, tutu has an adjectival function. See the discussion in the "Grammar Notes".
iti (Sim)
2.
this.
Here , tutu has a pronominal function. Often, when tutu is shortened to tu it refers to a person. See the discussion in the "Grammar Notes".
This its foolish appearance.
This seems stupid./ You appear stupid.