Ireland played its first Test in 2018. Here are the results of their first 7 Tests:

This looks bad-even Bangladesh had a draw in their 5th Test. But South Africa lost their first 8 Tests before drawing the 9th. In the early days SA was much weaker than England and Australia.
A Balbernie is the only player who played in all 7 Tests. Two others (McBrine and McCollum) have played in 6.
Most runs (200 or more):

Headed by LJ Tucker (351) and HT Tector (336).
4 batsmen have made a century. Tector has the most 50+ scores (4).
Highest innings scores (75 or more):

Headed by KJ O’Brien in their maiden Test. No one else scored a century until 2023.
Most wickets (7 and above):

The most wickets are 14 by McBrine followed by 13 by Murtagh.
The best innings bowling is 6-118 by McBrine, followed by 5-13 by Murtagh. That helped to dismiss England for 85 in 2019. No one else has taken 4 or more wickets in an innings.
The best match bowling is 7-170 by McBrine, followed by 6-65 by Murtagh.
Fielding (3 or more dismissals):

The most dismissals are 7 by LJ Tucker, which includes 5 catches and 2 stumpings. GC Wilson has 6 catches as a keeper.
Balbirnie and Stirling have 4 catches each as fielders.
The best all-rounder appears to be the present captain A Balbirnie, who has 318 runs and 14 wickets.