In Jainism, there are 24 Tirthankaras in a cosmic cycle. Mahavira is the 24th and last Tirthankara of the present cycle. There are no “future” Tirthankaras within this cycle.

• After Mahavira, the current cosmic age will eventually cycle again, and a new set of 24 Tirthankaras will appear, starting with Rishabhanatha (Adinath) in the next cycle. This is the standard view shared by both Digambara and Śvetāmbara traditions.
• There is no disagreement between the main traditions on the fact that Mahavira is the 24th in this cycle; only the lineup of names is part of the continuing cycle in the next era.

If you’d like, I can list the 24 Tirthankaras of the present cycle (including their names and a brief note about each).