Yes, Micromax Canvas Infinity has the LED notification light.
Yes, Micromax Canvas Infinity does have the support for OTG. You can attach pen drives easily.
Yes, you can change fonts in Micromax Canvas Infinity.
No. Micromax Canvas Infinity does not have the fast charging or dash charging. You need to buy Sony CP-AD2 fast charger if you want fast charging.
Yes, Micromax Canvas Infinity does have the removable battery. It has huge 2900 mAh Li-Ion battery.